calendar popup

un bout de code à l'étude...
il n'est pas entièrement finalisé, mais au moins ça donne une bonne base de départ ...
Si ma mémoire est bonne j'ai modifié un code msdn pour se passer de popup ...
Code:
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<html>
 
<head>
<meta http-equiv="Content-Type" content="text/html; charset=windows-1252">
<title>Calendrier SpaceFrog</title>
<script type='text/javascript'>
function show_calendar(str_target, str_datetime) {
   var arr_months = ["Janvier", "Février", "Mars", "Avril", "Mai", "Juin",
      "Juillet", "Août", "Septembre", "Octobre", "Novembre", "Décembre"];
   var week_days = ["Di", "Lu", "Ma", "Me", "Je", "Ve", "Sa"];
   var n_weekstart = 1; // day week starts from (normally 0 or 1)
 
// Si la date est invalide : Initialisation avec la date du jour
var test_date = /^(\d+)\/(\d+)\/(\d+)$/;
if (!test_date.exec(str_datetime))
{
var d = new Date();
 
var str_datetime = d.getDate()+ "/" +(d.getMonth() + 1) + "/"+  d.getYear();
 
}
 
   var dt_datetime = (str_datetime == null || str_datetime =="" ?  new Date() : str2dt(str_datetime));
 
   var dt_prev_month = new Date(dt_datetime);
   dt_prev_month.setMonth(dt_datetime.getMonth()-1);
   var dt_next_month = new Date(dt_datetime);
   dt_next_month.setMonth(dt_datetime.getMonth()+1);
 
   var dt_prev_year = new Date(dt_datetime);
   dt_prev_year.setFullYear(dt_datetime.getFullYear()-1);
   var dt_next_year = new Date(dt_datetime);
   dt_next_year.setFullYear(dt_datetime.getFullYear()+1);
 
   var dt_firstday = new Date(dt_datetime);
   dt_firstday.setDate(1);
   dt_firstday.setDate(1-(7+dt_firstday.getDay()-n_weekstart)%7);
   var dt_lastday = new Date(dt_next_month);
   dt_lastday.setDate(0);
   var title_calendar=(str_target=='dd')?'DATE D\'ARRIVEE':'DATE DE DEPART';
 
   // html generation (feel free to tune it for your particular application)
   // print calendar header
   var StringYear=dt_datetime.getFullYear().toString().substring(dt_datetime.getFullYear().toString().length-2,dt_datetime.getFullYear().toString().length)
   var str_buffer = new String (
      "<table class=\"clsOTable\" cellspacing=\"0\" border=\"0\" width=\"100%\">\n"+
      "<tr>\n<td bgcolor=\"#4682B4\">"+
      "<table cellspacing=\"1\" cellpadding=\"3\" border=\"0\" width=\"100%\">\n"+
 
	//ENTETE TABLEAU
	"<tr>\n   <td bgcolor=\"blue\" style='text-align:center;color:white;font-family:verdana;font-weight:bold;font-size:11px;' colspan=\"6\">"+title_calendar+"<\/td>\n"+
	"<td bgcolor=\"blue\" style=\"text-align:center;color:navy;font-family:verdana;font-weight:bold;font-size:10px;background-color:silver;border:outset 2px white;cursor:pointer;\" onclick=\"document.getElementById('DivCalendar').style.display='none';\">X<\/td>\n "+
	"<\/tr>\n"+
 
 
 
// Ligne Année précédente / suivante
      "<tr>\n   <td bgcolor=\"blue\"><a href=\"javascript:show_calendar('"+
      str_target+"', '"+ dt2dtstr(dt_prev_year)+"');\">"+
      "<img src=\"images/prev.gif\" width=\"16\" height=\"16\" border=\"0\""+
      " alt=\"Année précédente\"></a></td>\n"+
      "   <td align=\"center\" bgcolor=\"blue\" colspan=\"5\">"+
      "<font color=\"white\" face=\"tahoma, verdana\" size=\"2\">"
      +" 20"+StringYear+"</font></td>\n"+
      "   <td bgcolor=\"blue\" align=\"right\"><a href=\"javascript:show_calendar('"
      +str_target+"', '"+dt2dtstr(dt_next_year)+"');\">"+
      "<img src=\"images/next.gif\" width=\"16\" height=\"16\" border=\"0\""+
 
      " alt=\"Année suivante\"></a></td>\n</tr>\n"+
 
// Ligne Mois précédent / suivant
      "<tr>\n   <td bgcolor=\"#4682B4\"><a href=\"javascript:show_calendar('"+
      str_target+"', '"+ dt2dtstr(dt_prev_month)+"');\">"+
      "<img src=\"images/prev.gif\" width=\"16\" height=\"16\" border=\"0\""+
      " alt=\"Mois précédent\"></a></td>\n"+
      "   <td align=\"center\" bgcolor=\"#4682B4\" colspan=\"5\">"+
      "<font color=\"white\" face=\"tahoma, verdana\" size=\"2\">"
      +arr_months[dt_datetime.getMonth()]+" 20"+StringYear+"</font></td>\n"+
      "   <td bgcolor=\"#4682B4\" align=\"right\"><a href=\"javascript:show_calendar('"
      +str_target+"', '"+dt2dtstr(dt_next_month)+"');\">"+
      "<img src=\"images/next.gif\" width=\"16\" height=\"16\" border=\"0\""+
      " alt=\"Mois suivant\"></a></td>\n</tr>\n"
 
   ); //end newstring
 
   var dt_current_day = new Date(dt_firstday);
 
   // print weekdays titles
   str_buffer += "<tr>\n";
   for (var n=0; n<7; n++)
      str_buffer += "   <td bgcolor=\"#87CEFA\">"+
      "<font color=\"white\" face=\"tahoma, verdana\" size=\"2\">"+
      week_days[(n_weekstart+n)%7]+"</font></td>\n";
   // print calendar table
   str_buffer += "</tr>\n";
   while (dt_current_day.getMonth() == dt_datetime.getMonth() ||
      dt_current_day.getMonth() == dt_firstday.getMonth()) {
      // print row header
      str_buffer += "<tr>\n";
      for (var n_current_wday=0; n_current_wday<7; n_current_wday++) {
            if (dt_current_day.getDate() == dt_datetime.getDate() &&
               dt_current_day.getMonth() == dt_datetime.getMonth())
               // print current date
               str_buffer += "   <td bgcolor=\"#FFB6C1\" align=\"right\">";
            else if (dt_current_day.getDay() == 0 || dt_current_day.getDay() == 6)
               // weekend days
               str_buffer += "   <td bgcolor=\"#DBEAF5\" align=\"right\">";
            else
               // print working days of current month
               str_buffer += "   <td bgcolor=\"white\" align=\"right\">";
 
            if (dt_current_day.getMonth() == dt_datetime.getMonth())
               // print days of current month
               str_buffer += "<a style=\"cursor:pointer;\" onclick=\"document.getElementById('"+str_target+"').value='"+dt2dtstr(dt_current_day)+"'; document.getElementById('DivCalendar').style.display='none';\">"+
 
               "<font color=\"black\" face=\"tahoma, verdana\" size=\"2\">";
            else
               // print days of other months
 
 
               str_buffer += "<font color=\"gray\" face=\"tahoma, verdana\" size=\"2\">";
            str_buffer += dt_current_day.getDate()+"</font></a></td>\n";
 
            dt_current_day.setDate(dt_current_day.getDate()+1);
      }
      // print row footer
      str_buffer += "</tr>\n";
   }
   // print calendar footer
   str_buffer +=  "</tr>\n</td>\n</table>\n" ;
 
 
 
   fenCalendrier=document.getElementById('DivCalendar');
   fenCalendrier.innerHTML=str_buffer;
   fenCalendrier.style.top=document.getElementById(str_target).offsetTop+"px";
   fenCalendrier.style.left=Number(document.getElementById(str_target).offsetLeft)+Number(document.getElementById(str_target).offsetWidth)+"px";
   fenCalendrier.style.display="block"
 
}
// datetime parsing and formatting routimes. modify them if you wish other datetime format
function str2dt (str_datetime) {
   var re_date = /^(\d+)\/(\d+)\/(\d+)$/;
   if (!re_date.exec(str_datetime))
      return alert("Invalid Datetime format: "+ str_datetime);
   return (new Date (RegExp.$3, RegExp.$2-1, RegExp.$1, RegExp.$4, RegExp.$5, RegExp.$6));
}
 
 
 
/***********************************
* Formatage de date pour affichage *
***********************************/
 
function dt2dtstr (dt_datetime) {
   var FormatedDate=""
 
   FormatedDate+=(dt_datetime.getDate().toString().length==1)?"0"+dt_datetime.getDate().toString():dt_datetime.getDate().toString();
   FormatedDate+="/";
 	FormatedDate+=((dt_datetime.getMonth()+1).toString().length==1)?"0"+(dt_datetime.getMonth()+1).toString():(dt_datetime.getMonth()+1).toString();
	FormatedDate+="/";
	FormatedDate+="20"+dt_datetime.getFullYear().toString().substring(dt_datetime.getFullYear().toString().length-2,dt_datetime.getFullYear()).toString()
	return FormatedDate;
}
 
function dt2tmstr (dt_datetime) {
   return (new String (
         dt_datetime.getHours()+":"+dt_datetime.getMinutes()+":"+dt_datetime.getSeconds()));
} 
 
 
 
/*************************
* comparaison des dates  *
*************************/
function comparedate(){
 
var maintenant=new Date()
maintenant=dt2dtstr(maintenant).split('\/').reverse().join('')
 
 
 
if(document.getElementById('da').value.length<1){
															alert("Entrez une date d\'arrivee");
															return false;
															}
 
var date_arrivee=document.getElementById('da').value.split('\/').reverse().join('');
if(date_arrivee<maintenant){
                             alert('vous ne pourrez pas arriver avant aujourd\'hui');
                             return false;
                             }
 
if(document.getElementById('da').value.length<1){
                                                 alert("Entrez une date de départ"); 
                                                 return false;
                                                 }
 
var date_depart=document.getElementById('dd').value.split('\/').reverse().join('');
if(date_arrivee>date_depart){
                             alert("Vous devez arriver avant de repartir!"); 
                             return false;
                             }
 
 
else {		
		return true;}
 
}
('votre nom')
</script>
</head>
 
<body >
<div id="DivCalendar" style="z-index:2; display:none; width:200px;height:235px; overflow:hidden;position:absolute;Top:1px; left:1px;" ></div>
<form name="calendar" action="javascript:alert('ok')" onsubmit="return comparedate()" method="post">
<input type='text' name='da' id='da' onfocus="show_calendar('da','jj,mm,aaaa')" style='text-align:right' readonly/><br/>
<input type='text' name='dd' id='dd' onfocus="show_calendar('dd')" readonly style='text-align:right' />
<input type='submit' value='envoyer'/>
</form>
</body>
 
</html>
PS: à priori il fonctionne aussi sous FireFox !!