<html> <head> <title>X/Y Marks the Spot</title> <script type="text/javascript"> function mouseDown(nsEvent) { var theEvent = nsEvent ? nsEvent : window.event; var locString = "X = " + theEvent.screenX + " Y = " + theEvent.screenY; alert(locString); } document.onmousedown=mouseDown; </script> </head> <body> </body> </html>