Déplacement d'une div

Bonjour,

Voilà un extrait d'un code récupéré sur le net et qui me pose problème :
Code:
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<HTML>
<HEAD>
<script type="text/javascript">
 
var X_OTHER = 1;
var X_LEFT = 2;
var X_RIGHT = 3;
 
var Y_OTHER = 1;
var Y_UP = 2;
var Y_DOWN = 3;
 
var vgCurrentElement = null;
var vgCurrentPositionX = X_OTHER;
var vgCurrentPositionY = Y_OTHER;
 
var vgCurrentX = 0;
var vgCurrentY = 0;
var vgCurrentWidth = 0;
var vgCurrentHeight = 0;
 
var vgMouseX = 0;
var vgMouseY = 0;
var vgMouseDiffX = 0;
var vgMouseDiffY = 0;
var vgMouseDown = false;
 
var vgTimerMouse;
var vgTimerTime = 20;
 
 
//----------------------------//
function position(e)
	{
    vgMouseX = (navigator.appName.substring(0,3) == "Net") ? e.pageX : event.x+document.body.scrollLeft;
    vgMouseY = (navigator.appName.substring(0,3) == "Net") ? e.pageY : event.y+document.body.scrollTop;
	}
 
//----------------------------//
function fnResizeDiv()
	{
    if(vgCurrentElement!=null && vgCurrentElement!=undefined)
	    {
	    document.getElementById(vgCurrentElement).style.left = vgCurrentX;
	    document.getElementById(vgCurrentElement).style.top = vgCurrentY;
	    document.getElementById(vgCurrentElement).style.width = vgCurrentWidth;
	    document.getElementById(vgCurrentElement).style.height = vgCurrentHeight;
	    }
	}
 
//----------------------------//
function fnOnMouseDown()
	{
    vgMouseDown = true;
 
    if(vgCurrentElement!=null && vgCurrentElement!=undefined)
	    {
        //Init of size
        vgCurrentX = document.getElementById(vgCurrentElement).offsetLeft;
        vgCurrentY = document.getElementById(vgCurrentElement).offsetTop;
        vgCurrentWidth = document.getElementById(vgCurrentElement).offsetWidth;
        vgCurrentHeight = document.getElementById(vgCurrentElement).offsetHeight;
 
        //Init of distance
        vgMouseDiffX = vgMouseX-vgCurrentX;
        vgMouseDiffY = vgMouseY-vgCurrentY;
 
        //Init of position
        if(vgMouseDiffX < 20 || (vgCurrentWidth-vgMouseDiffX) < 20)
	        {
            if(vgMouseDiffX < vgCurrentWidth/2)
                vgCurrentPositionX = X_LEFT;
            else
                vgCurrentPositionX = X_RIGHT;
		    }
        else
            vgCurrentPositionX = X_OTHER;
 
        if(vgMouseDiffY < 20 || (vgCurrentHeight-vgMouseDiffY) < 20)
			{
            if(vgMouseDiffY > vgCurrentHeight/2)
                vgCurrentPositionY = Y_DOWN;
            else
                vgCurrentPositionY = Y_UP;
	        }
        else
            vgCurrentPositionY = Y_OTHER;
			vgTimerMouse = setInterval("fnOnMouseMove();", vgTimerTime);
			}
	}
 
function fnOnMouseUp()
	{
    vgMouseDown = false;
    clearInterval(vgTimerMouse);
	}
 
function fnOnMouseMove()
	{
    if(vgMouseDown && vgCurrentElement!=null && vgCurrentElement!=undefined)
	    {
        switch(vgCurrentPositionX)
		    {
            case X_LEFT:
                vgCurrentWidth += vgCurrentX-vgMouseX;
                if(vgCurrentWidth<0)
                    vgCurrentWidth = 0;
                else
                    vgCurrentX = vgMouseX;
                break;
            case X_RIGHT:
                vgCurrentWidth = vgMouseX-vgCurrentX;
				if(vgCurrentWidth<0)
				    vgCurrentWidth = 0;
				break;
            default: break;
			}
        switch(vgCurrentPositionY)
			{
            case Y_UP:
                vgCurrentHeight += vgCurrentY-vgMouseY;
                if(vgCurrentHeight<0)
                    vgCurrentHeight = 0;
                else
                    vgCurrentY = vgMouseY;
                break;
            case Y_DOWN:
                vgCurrentHeight = vgMouseY-vgCurrentY;
                if(vgCurrentHeight<0)
                    vgCurrentHeight = 0;
                break;
            default: break;
			}
 
        if(vgCurrentPositionX==X_OTHER && vgCurrentPositionY==Y_OTHER)
			{
            vgCurrentX = vgMouseX-vgMouseDiffX;
            vgCurrentY = vgMouseY-vgMouseDiffY;
			}
        fnResizeDiv();
		}
	}
 
function fnOnMouseOver(sSelectedElementName)
	{
    if(!vgMouseDown)
		{
        if(sSelectedElementName==null && sSelectedElementName!="undefined")
			{
			vgCurrentElement = null;
			}
        else
			{
			vgCurrentElement = sSelectedElementName;
			}
		}
	}
 
//----------------------------//
function fnOnLoad()
	{
    if(navigator.appName.substring(0,3) == "Net")
        document.captureEvents(Event.MOUSEMOVE);
		document.onmousemove = position;
		//fnResizeDiv();
	}
</script>
</HEAD>
<body onLoad="fnOnLoad();" onMouseDown="fnOnMouseDown();" onMouseUp="fnOnMouseUp();">
 
<div id="MonDiv" name="MonDiv" onMouseOver="fnOnMouseOver('MonDiv');" onMouseOut="fnOnMouseOver();" style="cursor:move; display:block; border-width:2px; border-style:solid; top:250px; left:500px; position:absolute; background-color:lightgrey;">
	<table align="center" border="2">
		<tr>
			<td bgColor="#8db4e2">
				<font face="arial" size="2" color="white">
				<strong>
				<input type="text" size="20">
				</strong>
				</font>
			</td>
		</tr>
	</table>
	<p align="center">
		<input type="button" name="btnValider" value="Valider">
		&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
		<input type="button" name="btnAnnuler" value="Annuler">
	</p>
	<br>
</div>
</BODY>
</HTML>
Le souci est que si je saisis du texte dans mon input, je ne peux pas le sélectionner en faisant glisser la souris.
La fenêtre se déplace.

Comment faudrait-il faire pour dire que, si la souris est sur un input, ne pas déplacer la fenêtre ?

Merci.