Хочу двигать DIV мышкой

<div id="WIND" style="position:absolute; width:200px; height:200px; left:120px; top:120px; border : solid 1px red">
Тест 
</div>

<script language="JavaScript1.2">
// Зона за которую можно таскать
var x = 0;
var y = 0;
var w = 100;
var h = 100;

document.onmousemove = MouseEvent;
document.onmousedown = MousePress; 
document.onmouseup = MouseUnPress;

var browser = navigator.appName;
var ver = parseInt(navigator.appVersion);

if (browser != "Microsoft Internet Explorer")
{
	document.captureEvents(Event.MOUSEDOWN | Event.MOUSEUP);
	document.captureEvents(Event.MOUSEMOVE);
	obj = document.getElementById('WIND');
}
else
{
	document.onselectstart = checkEl;
	document.ondragstart = checkEl;
	obj = document.all.item('WIND');
}

function checkEl() 
{
   return false;  
}

var pressflag = false;
var oldcursx, oldcursy;
var firstflag = true;
var flag = false;

function MouseEvent(ev) 
{
	windx = parseInt(obj.style.left);
	windy = parseInt(obj.style.top);
	cursx = (browser == "Microsoft Internet Explorer") ? event.clientX : ev.clientX;
	cursy = (browser == "Microsoft Internet Explorer") ? event.clientY : ev.clientY;

	if(firstflag)
	{
		oldcursx = cursx;
		oldcursy = cursy;
		firstflag = false;
	}

	if (flag) {
		obj.style.left = windx + cursx - oldcursx;
		obj.style.top =  windy + cursy - oldcursy;
	}
	oldcursx = cursx;
	oldcursy = cursy;
} 

function MousePress()
{
	if ( (cursx > windx+x) && 
		 (cursy > windy+y) &&
		 (cursx < windx+x+w) &&
		 (cursy < windy+y+h) )  
	{
		obj.style.cursor = "move";
		flag = true;
	}
}
 
function MouseUnPress()
{
	if (flag)
	{
		pressflag = flag = false;
		obj.style.cursor = "auto";
	}
}
</script>