probleme checkbox enbale/disable

bonjour tous,

j'ai un petit probleme dans mon script sur lequelle je ne trouve pas la solution.
je desirais désactiver un bouton dans un formulaire lorsque une checkbox n'est pas cocher, quand je copie le code dans un page html vide tous fonctionne mais une fois avec le reste du script j'ai une page blanche et j'ai "Terminer" dans le navigateur.

besoisns d'un petit coup de pouce merci a tous !!!!
le code activation et désactivation est en rouge


{strip}
<script type="text/javascript">
/* <![CDATA[ */
function validateme(form)
{ldelim}
var tz=form.txttimezone.value;
ErrorCount=0;
ErrorMsg = new Array();
ErrorMsg[0]="------------------------- The Following Errors Occured -------------------------" + String.fromCharCode(13);

/* log details */
CheckFieldString("noblank",form.txtusername,"{$lang.signup_js_errors.username_noblank}");
CheckFieldString("noblank",form.txtpassword,"{$lang.signup_js_errors.password_noblank}");
CheckFieldString("noblank",form.txtpassword2,"{$lang.signup_js_errors.con_password_noblank}");
/*profile*/
CheckFieldString("noblank",form.txtfirstname,"{$lang.signup_js_errors.firstname_noblank}");
CheckFieldString("noblank",form.txtlastname,"{$lang.signup_js_errors.lastname_noblank}");
CheckFieldString("noblank",form.txtemail,"{$lang.signup_js_errors.email_noblank}");
/*address*/

{ if $config.state_mandatory eq 'Y' }
CheckFieldString("noblank",form.txtstateprovince,"{$lang.signup_js_errors.stateprovince_noblank}");
{/if}
{ if $config.county_mandatory eq 'Y' }
CheckFieldString("noblank",form.txtcounty,"{$lang.signup_js_errors.county_noblank}");
{/if}
{ if $config.city_mandatory eq 'Y' }
CheckFieldString("noblank",form.txtcity,"{$lang.signup_js_errors.city_noblank}");
{/if}
{ if $config.zipcode_mandatory eq 'Y' }
CheckFieldString("noblank",form.txtzip,"{$lang.signup_js_errors.zip_noblank}");
{/if}
/*preferences
empty */

/*log details*/
CheckFieldString("alphanum",form.txtusername,"{$lang.signup_js_errors.username_charset}");
CheckFieldString("alphanum",form.txtpassword,"{$lang.signup_js_errors.password_charset}");

/*profile*/
CheckFieldString("text",form.txtfirstname,"{$lang.signup_js_errors.firstname_charset}");
CheckFieldString("text",form.txtlastname,"{$lang.signup_js_errors.lastname_charset}");
CheckFieldString("email",form.txtemail,"{$lang.signup_js_errors.email_notvalid}");
/*address*/
CheckFieldString("text",form.txtcounty,"{$lang.signup_js_errors.county_charset}");
CheckFieldString("text",form.txtcity,"{$lang.signup_js_errors.city_charset}");
CheckFieldString("alphanumeric",form.txtzip,"{$lang.signup_js_errors.zip_charset}");
/*preferences*/
CheckFieldString("text",form.txtlookcity,"{$lang.signup_js_errors.address_charset}");
CheckFieldString("alphanumeric",form.txtlookzip,"{$lang.signup_js_errors.address_charset}");

if(form.txtusername.value.length >= {$config.min_username_len} && form.txtusername.value.length <= {$config.max_username_len}){ldelim}
if ( !isNaN(form.txtusername.value.charAt(0)) ){ldelim}
ErrorCount++;
ErrorMsg[ErrorCount] = "{$lang.signup_js_errors.username_start_alpha}" + String.fromCharCode(13);
{rdelim}
{rdelim}else{ldelim}
ErrorCount++;
ErrorMsg[ErrorCount] = "{$lang.signup_js_errors.username_outrange}" + String.fromCharCode(13);
{rdelim}

if( form.txtpassword.value.length >= {$config.min_pass_len} && form.txtpassword.value.length <= {$config.max_pass_len}){ldelim}
if ( form.txtpassword.value != form.txtpassword2.value ){ldelim}
ErrorCount++;
ErrorMsg[ErrorCount] = "{$lang.signup_js_errors.password_nomatch}" + String.fromCharCode(13);
{rdelim}
{rdelim}else{ldelim}
ErrorCount++;
ErrorMsg[ErrorCount] = "{$lang.signup_js_errors.password_outrange}" + String.fromCharCode(13);
{rdelim}
if (tz == '-25') {ldelim}
ErrorCount++;
ErrorMsg[ErrorCount]="{$lang.signup_js_errors.timezone_noblank}" + String.fromCharCode(13) + String.fromCharCode(10);
{rdelim}

/* concat all error messages into one string */
result="";
if( ErrorCount > 0)
{ldelim}
/* for( c in ErrorMsg)
result += ErrorMsg[c]; */
alert(ErrorMsg[1]);
return false;
{rdelim}
return true;
{rdelim}
/* ]]> */
}
</script>
<SCRIPT LANGUAGE="JavaScript">

function Disab(){
frm=document.forms[0]
if(frm.cbox.checked)
{frm.Button1.disabled=true}
else {frm.Button1.disabled=false}
}

</SCRIPT><table width="571" border="0" cellpadding="0" cellspacing="0" >
<tr>
<td class="module_detail" width="571">
<table width="571" border="0" cellpadding="0" cellspacing="0">
<tr>
<td width="77"><img src="{$image_dir}blue_window_3_bars.jpg" width="77" height="25" alt="" /></td>
<td class="module_head" width="494">
{$lang.signup}
</td>
</tr>
</table>
<form name="frmSignup" id="frmSignup" method="post" action="savesignup.php" onsubmit="javascript: return validateme(this);">
<table width="571" border="0" cellpadding="0" cellspacing="9">
<tr>
<td width="100%" valign="top">
{if $smarty.get.errid != ''}
<font color="#FF0000">{$lang.errormsgs[$smarty.get.errid]}</font><br /><br />
{/if}
<font color="{$lang.required_info_indicator_color}">{$lang.required_info_indicator}</font>{$lang.required_info_indication}
<br /><br />
<table width="550" border="0" cellpadding="0" cellspacing="0" >
<tr>
<td class="module_detail_inside" width="100%">
<table width="100%" border="0" cellpadding="0" cellspacing="0">
<tr>
<td class="module_head" width="6"></td>
<td class="module_head" width="516">
{$lang.signup_subtitle_login}
</td>
<td width="28"><img src="{$image_dir}blue_hor2.jpg" width="28" height="23" alt="" /></td>
</tr>
</table>
<table width="100%" border="0" cellspacing="{$config.cellspacing}" cellpadding="{$config.cellpadding}">
<tr>
<td width="100%">
<table width="100%" border="0" cellspacing="{$config.cellspacing}" cellpadding="{$config.cellpadding}">
<tr>
<td height="2" >{$lang.signup_username}
<font color="{$lang.required_info_indicator_color}">{$lang.required_info_indicator}</font></td>
<td height="2" > <input class="input" maxlength="25" name="txtusername" size="{$config.max_username_len}" value="{$smarty.session.username}" />&nbsp;
({$config.min_username_len}{$lang.to}{$config.max_username_len}&nbsp;{$lang.characters})
</td>
</tr>
<tr>
<td>{$lang.signup_password}
<font color="{$lang.required_info_indicator_color}">{$lang.required_info_indicator}</font></td>
<td> <input class="input" type="password" name="txtpassword" size="{$config.max_pass_len}" value="{$password}" />&nbsp;({$config.min_pass_len}{$lang.to}{$config.max_pass_len}&nbsp;{$lang.characters})
</td>
</tr>
<tr>
<td>{$lang.signup_confirm_password}
<font color="{$lang.required_info_indicator_color}">{$lang.required_info_indicator}</font></td>
<td> <input class="input" type="password" name="txtpassword2" size="{$config.max_pass_len}" value="{$password2}" />
</td>
</tr>
</table>
</td>
</tr>
</table>
</td>
</tr>
</table>
<br />
<table width="550" border="0" cellpadding="0" cellspacing="0" >
<tr>
<td class="module_detail_inside" width="100%">
<table width="100%" border="0" cellpadding="0" cellspacing="0">
<tr>
<td class="module_head" width="6"></td>
<td class="module_head" width="516">
{$lang.signup_subtitle_profile}
</td>
<td width="28"><img src="{$image_dir}blue_hor2.jpg" width="28" height="23" alt="" /></td>
</tr>
</table>
<table width="100%" border="0" cellspacing="{$config.cellspacing}" cellpadding="{$config.cellpadding}">
<tr>
<td width="100%">
<table width="100%" border="0" cellspacing="{$config.cellspacing}" cellpadding="{$config.cellpadding}">
<tr>
<td width="33%">{$lang.signup_firstname}
<font color="{$lang.required_info_indicator_color}">{$lang.required_info_indicator}</font></td>
<td width="67%"><input class="input" maxlength="50" name="txtfirstname" value="{$smarty.session.firstname}" /></td>
</tr>
<tr>
<td>{$lang.signup_lastname}
<font color="{$lang.required_info_indicator_color}">{$lang.required_info_indicator}</font></td>
<td> <input class="input" maxlength="50" name="txtlastname" value="{$smarty.session.lastname}" /> </td>
</tr>
<tr>
<td>{$lang.signup_email}
<font color="{$lang.required_info_indicator_color}">{$lang.required_info_indicator}</font></td>
<td> <input class="input" maxlength="255" name="txtemail" size="40" value="{$smarty.session.email}" />
</td>
</tr>
<tr>
<td>{$lang.signup_gender}:
<font color="{$lang.required_info_indicator_color}">{$lang.required_info_indicator}</font></td>
<td> <select class="select" style="width: 80px;" name="txtgender" >
{html_options options=$lang.signup_gender_values selected=$smarty.session.gender}
</select>&nbsp;
{$lang.looking_for_a}&nbsp;
<select class="select" style="width: 100px" name="txtlookgender">
{if $smarty.session.lookgender == ''}
{html_options options=$lang.signup_gender_look selected='F'}
{else}
{html_options options=$lang.signup_gender_look selected=$smarty.session.lookgender }
{/if}
</select> </td>
</tr>
<tr>
<td>{$lang.signup_pref_age_range}:
<font color="{$lang.required_info_indicator_color}">{$lang.required_info_indicator}</font></td>
<td> <select class="select" style="width: 50px" name="txtlookagestart">
{html_options values=$lang.start_agerange output=$lang.start_agerange selected=$smarty.session.txtlookagestart}
</select>
{$lang.to}
<select class="select" style="width: 50px" name="txtlookageend">
{html_options values=$lang.end_agerange output=$lang.end_agerange selected=$smarty.session.txtlookageend}
</select>&nbsp;
{$lang.signup_year_old}. </td>
</tr>
<tr>
<td>{$lang.signup_birthday}
<font color="{$lang.required_info_indicator_color}">{$lang.required_info_indicator}</font></td>
<td>
{html_select_date_translated prefix="txtbirth" start_year=$config.start_year end_year=$config.end_year month_value_format="%m" time=$selectedtime}
</td>
</tr>
</table>
</td>
</tr>
</table>
</td>
</tr>
</table>
<br />
<table width="550" border="0" cellpadding="0" cellspacing="0" >
<tr>
<td class="module_detail_inside" width="100%">
<table width="100%" border="0" cellpadding="0" cellspacing="0">
<tr>
<td class="module_head" width="6"></td>
<td class="module_head" width="516">
{$lang.signup_subtitle_address}
</td>
<td width="28"><img src="{$image_dir}blue_hor2.jpg" width="28" height="23" alt="" /></td>
</tr>
</table>
<table width="100%" border="0" cellspacing="{$config.cellspacing}" cellpadding="{$config.cellpadding}">
<tr>
<td width="100%">
<table width="100%" border="0" cellspacing="{$config.cellspacing}" cellpadding="{$config.cellpadding}" id="tbl2">
<tr>
<td>
{$lang.timezone}
<font color="{$lang.required_info_indicator_color}">{$lang.required_info_indicator}</font>
</td>
<td>

<select class="select" style="width: 175px;" name="txttimezone">
{html_options options=$lang.tz selected=$smarty.session.timezone}
</select>
</td>
</tr>
<tr>
<td width="33%">{$lang.signup_country}
<font color="{$lang.required_info_indicator_color}">{$lang.required_info_indicator}</font> </td>
<td width="67%"><select class="select" style="width: 175px;" name="txtfrom" id="txtfrom" onchange="javascript: this.form.chgcntry.value='1'; this.form.submit();" >
{html_options options=$lang.countries selected=$smarty.session.from}
</select>
<input type="hidden" name="chgcntry" id="chgcntry" value="" />
</td>
</tr>
<tr>
<td width="172">
{$lang.signup_state_province}
{if $config.state_mandatory == 'Y'}
<font color="{$lang.required_info_indicator_color}">{$lang.required_info_indicator}</font>
{/if}
</td>
<td width="344">
{ if $lang.states|@count > 0}
<select class="select" style="width: 175px" name="txtstateprovince" onchange="javascript: this.form.chgcntry.value='1'; this.form.submit();" >
{html_options options=$lang.states selected=$smarty.session.stateprovince}
</select>
{ else }
<input name="txtstateprovince" type="text" size="30" maxlength="100" value="{$txtstateprovince}" />
{ /if}
</td>
</tr>
<tr>
<td width="172">{$lang.manage_counties}:
{if $config.county_mandatory == 'Y'}
<font color="{$lang.required_info_indicator_color}">{$lang.required_info_indicator}</font>
{/if}
</td>
<td width="344">
{ if $lang.counties|@count > 0}
<select class="select" style="width: 175px" name="txtcounty" onchange="javascript: this.form.chgcntry.value='1'; this.form.submit();" >
{html_options options=$lang.counties selected=$smarty.session.countycode}
</select>
{ else }
<input name="txtcounty" type="text" size="30" maxlength="100" value="{$smarty.session.countycode}" />
{ /if}
</td>
</tr>
<tr>
<td>
{$lang.signup_city}
{if $config.city_mandatory == 'Y' }
<font color="{$lang.required_info_indicator_color}">{$lang.required_info_indicator}</font>
{/if}
</td>
<td>
{ if $lang.cities|@count > 0}
<select class="select" style="width: 175px" name="txtcity" onchange="javascript: this.form.chgcntry.value='1'; this.form.submit();" >
{html_options options=$lang.cities selected=$smarty.session.citycode}
</select>
{ else }
<input name="txtcity" type="text" size="30" maxlength="100" value="{$smarty.session.citycode}" />
{ /if}
</td>
</tr>
<tr>
<td>
{$lang.signup_zip}
{if $config.zipcode_mandatory == 'Y' }
<font color="{$lang.required_info_indicator_color}">{$lang.required_info_indicator}</font>
{/if}
</td>
<td>
{ if $lang.zipcodes|@count > 0}
<select class="select" style="width: 175px" name="txtzip">
{html_options options=$lang.zipcodes selected=$smarty.session.zip}
</select>
{ else }
<input name="txtzip" type="text" size="30" maxlength="100" value="{$smarty.session.zip}" />
{ /if}
</td>
</tr>
<tr>
<td>
{$lang.signup_address1}
</td>
<td>
<input class="input" maxlength="255" name="txtaddress1" size="40" value="{$smarty.session.address1}" />
</td>
</tr>
<tr>
<td height="22">
{$lang.signup_address2}
</td>
<td height="22">
<input class="input" maxlength="255" name="txtaddress2" size="40" value="{$smarty.session.address2}" />
</td>
</tr>
</table>
</td>
</tr>
</table>
</td>
</tr>
</table>
<br />
<table width="550" border="0" cellpadding="0" cellspacing="0" >
<tr>
<td class="module_detail_inside" width="100%">
<table width="100%" border="0" cellpadding="0" cellspacing="0">
<tr>
<td class="module_head" width="6"></td>
<td class="module_head" width="516">
{$lang.signup_subtitle_preference}
</td>
<td width="28"><img src="{$image_dir}blue_hor2.jpg" width="28" height="23" alt="" /></td>
</tr>
</table>
<table width="100%" border="0" cellspacing="{$config.cellspacing}" cellpadding="{$config.cellpadding}">
<tr>
<td width="100%">
<table width="100%" border="0" cellspacing="{$config.cellspacing}" cellpadding="{$config.cellpadding}" id="tbl">
<tr>
<td colspan="2">{$lang.signup_where_should_we_look} </td>
</tr>
<tr>
<td width="33%">
{$lang.signup_country}
<font color="{$lang.required_info_indicator_color}">{$lang.required_info_indicator}</font>
</td>
<td width="67%">
<select class="select" style="width: 175px;" name="txtlookfrom" onchange="javascript:this.form.chgcntry.value='1'; this.form.submit();">
{html_options options=$lang.lookcountries selected=$smarty.session.lookfrom}
</select>
</td>
</tr>
<tr>
<td width="172">{$lang.signup_state_province}
<td width="344">
{ if $lang.lookstates|@count > 0 }
<select class="select" style="width: 175px" name="txtlookstateprovince" onchange="javascript:this.form.chgcntry.value='1'; this.form.submit();">
{html_options options=$lang.lookstates selected=$smarty.session.lookstateprovince}
</select>
{else}
<input name="txtlookstateprovince" value="{$smarty.session.lookstateprovince}" size="30" maxlength="200" />
{/if}
</td>
</tr>
<tr>
<td width="172">{$lang.manage_counties}:
</td>
<td width="344">
{ if $lang.lookcounties|@count > 0}
<select class="select" style="width: 175px" name="txtlookcounty" onchange="javascript: this.form.chgcntry.value='1'; this.form.submit();" >
{html_options options=$lang.lookcounties selected=$smarty.session.lookcounty}
</select>
{ else }
<input name="txtlookcounty" type="text" size="30" maxlength="100" value="{$smarty.session.lookcounty}" />
{ /if}
</td>
</tr>
<tr>
<td>
{$lang.signup_city}
</td>
<td>
{ if $lang.lookcities|@count > 0}
<select class="select" style="width: 175px" name="txtlookcity" onchange="javascript: this.form.chgcntry.value='1'; this.form.submit();" >
{html_options options=$lang.lookcities selected=$smarty.session.lookcity}
</select>
{ else }
<input name="txtlookcity" type="text" size="30" maxlength="100" value="{$smarty.session.lookcity}" />
{ /if}
</td>
</tr>
<tr>
<td>
{$lang.signup_zip}
</td>
<td>
{ if $lang.lookzipcodes|@count > 0}
<select class="select" style="width: 175px" name="txtlookzip">
{html_options options=$lang.lookzipcodes selected=$smarty.session.lookzip}
</select>
{ else }
<input name="txtlookzip" type="text" size="30" maxlength="100" value="{$smarty.session.lookzip}" />
{ /if}
</td>
</tr>
<tr>
<td>{$lang.signup_view_online}
<font color="{$lang.required_info_indicator_color}">{$lang.required_info_indicator}</font></td>
<td align="left"><input class="radio" type="radio" checked="checked" value="1" name="txtviewonline" />
{$lang.yes}&nbsp;
<input class="radio" type="radio" value="0"
name="txtviewonline" />
{$lang.no} </td>
</tr>

</table>
</td>
</tr>
</table>
</td>
</tr>
</table>
{$lang.signup_terms_of_us}<font color="{$lang.required_info_indicator_color}">
{$lang.required_info_indicator}
<input name="cbox" type="checkbox" id="cbox" value="checkbox" onClick=Disab();> </font><br />
<center>
<input type="submit" class="formbutton" value='{$lang.submit}' name="button1" />&nbsp;<input type="reset" class="formbutton" value='{$lang.reset}' />
</center>
</td>
</tr>
</table>
</form>
</td>
</tr>
</table>
{/strip}

les boutons ne font pas parti d'un formulaire!

ajoute les tag code!

Code:

---

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<html> <SCRIPT LANGUAGE="JavaScript"> function Disab(valBol){ document.getElementById("button1").disabled=valBol; } </SCRIPT> <body> <form> <input name="cbox" type="checkbox" id="cbox" value="checkbox" onClick="Disab(this.checked);"> <input type="submit" class="formbutton" value='test' id="button1" /> </form> </body> </html>

---