Get mouse screen X and Y : Mouse Event « Event « JavaScript Tutorial

<html>
<head>
<title>Mouse Events Example</title>
<script type="text/javascript">
    function handleEvent(oEvent) {
        var oTextbox = document.getElementById("txt1");
        oTextbox.value += "\n    at (" + oEvent.screenX + "," + oEvent.screenY + ") on the screen";
    }
</script>
</head>
<body>
<P>Use your mouse to click and double click the red square.</p>
<div style="width: 100px; height: 100px; background-color: red"
     onclick="handleEvent(event)"
     id="div1"></div>
<P><textarea id="txt1" rows="15" cols="50"></textarea></p>
</body>
</html>

15.8.Mouse Event
	15.8.1.	Get mouse clicked button
	15.8.2.	Is Shift key pressed during the mouse click
	15.8.3.	Is alt key pressed during the mouse click
	15.8.4.	Is control key pressed during the mouse click
	15.8.5.	Mouse event target element name
	15.8.6.	Mouse event from and to elements (IE)
	15.8.7.	Mouse event related element (Firefox)
	15.8.8.	onmouseover event handler
	15.8.9.	onmouseout event handler
	15.8.10.	onmousedown event handler
	15.8.11.	onmouseup event handler
	15.8.12.	onclick mouse event handler
	15.8.13.	ondblclick mouse event handler
	15.8.14.	Display current mouse position in status bar (IE)
	15.8.15.	Use mouse in/out action to trigger the style change
	15.8.16.	Get mouse client X and Y
	15.8.17.	Get mouse screen X and Y
	15.8.18.	Set element's pixelTop and pixelLeft to current mouse event (IE)
	15.8.19.	Get X/Y screen position (IE)