hmmm.. not sure if you can, but you could try setting the onmouseover event in all of the objects in your document to display a specific cursor if a global variable is set...
( again, i have no idea if this'll work or not but go for it --- also if it worx then it would only work in IE )
<head>
<script type="text/javascript">
function changeAllOnOvers(){
for(i=0;i<document.all.length;i++){
document.all[i].onMouseOver="if window.myGlobalVar==1{this.style.cursor='hand'}"
}
}
</script>
</head>
<body onload="changeAllOnOvers();" ...
<img ondragstart="window.myGlobalVar=1;" ...
of course if this worx then it would change ALL of the onmouseover events in every object on the page visible/hidden/or otherwise... so you'd have to be careful to specify any objects to opmit this for if you have anyobjects that use the onmouseover event...