Capture true position of mouse

How do you capture the TRUE position of the mouse in an html document with javascript? I tried using event.y for the Y coordinate, but the value doesn't increase when you scroll down the page. Thanks.
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rbichonAsked:
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Pravin AsarPrincipal Systems EngineerCommented:
you need to add document.scrollOffsetX document.scrollOffsetY to  mouse co-ordinates to
get it's position from top-left of the page.
0
rbichonAuthor Commented:
document.scrollOffsetY comes up undefined.
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rbichonAuthor Commented:
How do I get the height of the viewable window?
0
Pravin AsarPrincipal Systems EngineerCommented:
<html>
<head>
<title>Window and Screen Size Details</title>
</head>
<body onscroll="reLocateDiv();">
<script language="javascript">
var wLeft = 0;
var wTop  = 0;
var wWidth=800;
var wHeight=600;
var scrWidth=0;
var scrHeight=0;

var wndDetail = new GetWindowDetails();
/*
alert ('Screen Resolution : ' + wndDet.sWidth + ' X ' + wndDet.sHeight);
alert ('Window Location   : ' + wndDet.wLeft + ' , ' + wndDet.wTop);
alert ('Window Size       : ' + wndDet.wWidth + ' X ' + wndDet.wHeight);
*/

function GetWindowDetails () {
WindowSize();
GetWindowLocation();
GetScreenResolution();
this.wWidth = wWidth;
this.wHeight = wHeight;
this.sWidth = scrWidth;
this.sHeight = scrHeight;
this.wLeft = wLeft;
this.wTop  = wTop;
return this;
}
// Get Window Size
function WindowSize()
{
     if( typeof( window.innerWidth ) == 'number' ) {
          //Non-IE
          wWidth = window.innerWidth;
          wHeight = window.innerHeight;
     }
     else if( document.documentElement &&
              (document.documentElement.clientWidth ||
               document.documentElement.clientHeight ) ) {
          //IE 6+ in 'standards compliant mode'
          wWidth = document.documentElement.clientWidth;
          wHeight = document.documentElement.clientHeight;
     }
     else if( document.body && 
              (document.body.clientWidth ||
                 document.body.clientHeight ) ) {
          //IE 4 compatible
          wWidth = document.body.clientWidth;
          wHeight = document.body.clientHeight;
     }
}

// Get Window Height
function GetWindowHeight () {
    WindowSize();
     return (wHeight-20);
}

// Get Window Width
function GetWindowWidth () {
    WindowSize();
     return (wWidth);
}

// Get Screen Resolution

function GetScreenResolution () {
   scrWidth = window.screen.width;
   scrHeight = window.screen.height;
}

// Get Window Location
function GetWindowLocation () {
    if (!document.layers && document.all) {
          wLeft = window.screenLeft;
          wTop = window.screenTop;
    }
    else {
          wLeft = window.screenX;
          wTop  = window.screenY;
    }
}

function resizeDiv()
{
   var wndDetail = new GetWindowDetails();
   var newWidth=wndDetail.wWidth - 100;
   if (newWidth>1000) newWidth=1000;
   document.getElementById("divMainContent").style.width=newWidth;

}
function rePositionDiv()
{
   var wndDetail = new GetWindowDetails();
   var divObj = document.getElementById("divMainContent");
   var newX= (parseInt (wndDetail.wWidth) - parseInt(divObj.style.width))/2;
   divObj.style.left = parseInt(newX);
   var newY= (parseInt (wndDetail.wHeight) - parseInt(divObj.style.height))/2;
   divObj.style.top = parseInt(newY);

}

function reLocateDiv () {
   var wndDetail = new GetWindowDetails();
   var divObj = document.getElementById("divMainContent");
   var newY= parseInt(orgPosY) +  parseInt (window.document.body.scrollTop);
   var newX= parseInt(orgPosX) +  parseInt (window.document.body.scrollLeft);
   window.status = newY + ' , ' + window.document.body.scrollTop;
   divObj.style.top =  parseInt(newY);
   divObj.style.left = parseInt(newX);
}
var divObj  = document.getElementById("divMainContent");
var orgPosY = 10;
var orgPosX = 10;
//window.onresize=rePositionDiv;
</script>
</head>
<body>
<span id="divMainContent" style="border: 1px solid black; position: absolute; top: 10px; left: 10px; width: 50px; height: 100px;">DIV OBJECT</span>
<div style="height: 1000px; width: 1000px; ">DIV</div>


</body>
</html>
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