Siri: preventDefault - onmouseup - Problem

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preventDefault - onmouseup - Problem

Siri
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Hallo,

unten ein zusammengschrumpftes JS. Wenn man die Maus losläßt gibt es in der Adresszeile des Browsers ein #, trotz preventDefault und cancelBubble. Was läuft da schief?

Viele Grüße
Siri

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">  
<html xmlns="http://www.w3.org/1999/xhtml">  
	<head>  
		<meta charset="utf-8"/>  
		<title></title>  
		<link rel="stylesheet" href="css/scrnav_test_01.css" type="text/css"/>  
		<script src="js/paloula/paloulacontentloaded.js" type="text/javascript"></script>  
	</head>  
	<body>	  
		<a href="#" name="nav1" id="linkxyz" class="scrollnavleftbutton" >Left</a>  
  
		<script>

	function init() {	  
			  
		var scrollNavLeftLoop = document.getElementById("linkxyz");  
	  
		var scrollNavHandler = new ScrollNavHandler();	  
		if (document.addEventListener) {				  
			scrollNavLeftLoop.addEventListener("mousedown", scrollNavHandler.scrollNavLeft,  false);		  
			scrollNavLeftLoop.addEventListener("mouseup", scrollNavHandler.scrollStop,  false);						  
		} else {					  
			scrollNavLeftLoop.onmousedown = scrollNavHandler.scrollNavLeft;		  
			scrollNavLeftLoop.onmouseup = scrollNavHandler.scrollStop;							  
		}		  
	  
	}  
	  
	function ScrollNavHandler() {		  
		  
		this.scrollStop = function(eventObject) {			  
			handlePreventObject(eventObject);		  
			alert("stop");  
		};  
		  
		this.scrollNavLeft = function(eventObject) {				  
			handlePreventObject(eventObject);						  
		};			  
		  
	}  
	  
	function handlePreventObject(eventObject) {  
	  
		if (!eventObject) eventObject = window.event;  
		  
		if (eventObject.preventDefault) {  
			eventObject.preventDefault();  
		} else {  
			eventObject.returnValue = false;  
		}		  
		  
	  
		if (eventObject.stopPropagation) {  
			eventObject.stopPropagation();  
		} else {  
			eventObject.cancelBubble = true;  
		}	  
  
		  
	}		  
  
	init();

		</script>  
	</body>  
</html>
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