This little function will retrieve the X & Y (horizontal & vertical) position of the mouse cursor in Internet Explorer, FireFox, and all other browsers.

function moveObject( e ) {
    var tempX = 0;
    var tempY = 0;
    if (document.all) {
        // must be IE
        tempX = event.clientX + document.body.scrollLeft;
        tempY = event.clientY + document.body.scrollTop;
    } else {
        tempX = e.pageX;
        tempY = e.pageY;
    }
    // prevent any negative values
    if (tempX < 0){tempX = 0}
    if (tempY < 0){tempY = 0}
    alert("X:" + tempX + "\r\nY:" + tempY);
}