Not work on IE

The below code work well on Crome but not in IE

[CODE]<script language=JavaScript>
var sTestEventType=’mousedown’;
function handleMouseEvent(e) {
var evt = (e==null ? event:e);
if (evt.type!=sTestEventType) return true;
if (evt.which==1) return true;
return false;
}
document.onmousedown=handleMouseEvent;
document.onmouseup=handleMouseEvent;
document.onclick=handleMouseEvent;
</script>
[/CODE]

Can anyone help to modified it to work in IE. Thanks

Also in #JavaScript _↴