document.onmousemove = this.getMouseXY;

Is there a problem with doing:

document.onmousemove = this.getMouseXY;

Before a do the line above it knows exactly what object "this" refers to. I then calls the function fine (I've declared them as methods of the function). But then within the method getMouseXY the alert doesn't remember what object I was on, i.e. displays [Object] instead of [object Object]. Any ideas?

I guess I could store the object ID in a variable before calling the function, and then pick it up again from within the getMouseXY - it's just that solution is a bit untidy, and it would be easier to follow if I could just use the "this".

function startCheckMousePos()
{
     // Start detecting where the mouse is.
     
     // Detect if the browser is IE or not.
     // If it is not IE, we assume that the browser is NS.
     var IE = document.all?true:false;
     
     // If NS -- that is, !IE -- then set up for mouse capture
     if (!IE) document.captureEvents(Event.MOUSEMOVE);
     
     // Set-up to use getMouseXY function onMouseMove
     document.onmousemove = this.getMouseXY;
}

function stopCheckMousePos()
{
     // Stop detecting where the mouse is.
     
     // Detect if the browser is IE or not.
     // If it is not IE, we assume that the browser is NS.
     var IE = document.all?true:false;
     
     // If NS -- that is, !IE -- then set up for mouse capture
     if (!IE) document.releaseEvents(Event.MOUSEMOVE);
     
     document.onmousemove = null;
}

function getMouseXY(e)
{
     // Main function to retrieve mouse x-y position of the mouse.
     
     // Temporary variables to hold mouse x-y positions.
     var tempX = 0;
     var tempY = 0;
     
     // Detect if the browser is IE or not.
     // If it is not IE, we assume that the browser is NS.
     var IE = document.all?true:false
     
     if (IE)
     {
          // grab the x-y pos.s if browser is IE
          tempX = event.clientX + document.body.scrollLeft;
          tempY = event.clientY + document.body.scrollTop;
     }
     else
     {
          // grab the x-y pos.s if browser is NS
          tempX = e.pageX;
          tempY = e.pageY;
     }
     
     // catch possible negative values in NS4
     
     if (tempX < 0) {tempX = 0}
     if (tempY < 0) {tempY = 0}
     
     // show the position values in the form named Show
     // in the text fields named MouseX and MouseY
     
     document.Show.MouseX.value = tempX;
     document.Show.MouseY.value = tempY;
     
     if (tempX == 100)
     {
          //alert(document.getElementById(this.knowdeID).style.left);
          alert(this.knowdeID); // Seems to have forgotten which object I am on!
     }
     
     return true;
}