// Set Netscape up to run the "captureMousePosition" function whenever
// the mouse is moved. For Internet Explorer and Netscape 6, you can capture
// the movement a little easier.
if (document.layers) { // Netscape
    document.captureEvents(Event.MOUSEMOVE);
    document.onmousemove = captureMousePosition;
} else if (document.all) { // Internet Explorer
    document.onmousemove = captureMousePosition;
} else if (document.getElementById) { // Netcsape 6
    document.onmousemove = captureMousePosition;
}
// Global variables
xMousePos = 0; // Horizontal position of the mouse on the screen
yMousePos = 0; // Vertical position of the mouse on the screen
xMousePosMax = 0; // Width of the page
yMousePosMax = 0; // Height of the page

function captureMousePosition(e) {
   if (document.layers) {
       // When the page scrolls in Netscape, the event's mouse position
       // reflects the absolute position on the screen. innerHight/Width
       // is the position from the top/left of the screen that the user is
       // looking at. pageX/YOffset is the amount that the user has
       // scrolled into the page. So the values will be in relation to
       // each other as the total offsets into the page, no matter if
       // the user has scrolled or not.
       xMousePos = e.pageX;
       yMousePos = e.pageY;
       xMousePosMax = window.innerWidth+window.pageXOffset;
       yMousePosMax = window.innerHeight+window.pageYOffset;
   } else if (document.all) {
       // When the page scrolls in IE, the event's mouse position
       // reflects the position from the top/left of the screen the
       // user is looking at. scrollLeft/Top is the amount the user
       // has scrolled into the page. clientWidth/Height is the height/
       // width of the current page the user is looking at. So, to be
       // consistent with Netscape (above), add the scroll offsets to
       // both so we end up with an absolute value on the page, no
       // matter if the user has scrolled or not.
       xMousePos = window.event.x+document.body.scrollLeft;
       yMousePos = window.event.y+document.body.scrollTop;
       xMousePosMax = document.body.clientWidth+document.body.scrollLeft;
       yMousePosMax = document.body.clientHeight+document.body.scrollTop;
   } else if (document.getElementById) {
       // Netscape 6 behaves the same as Netscape 4 in this regard
       xMousePos = e.pageX;
       yMousePos = e.pageY;
       xMousePosMax = window.innerWidth+window.pageXOffset;
       yMousePosMax = window.innerHeight+window.pageYOffset;
   }
}