rem: lastFocusId=target.id; Wicket.Log.info("focus set on " + lastFocusId); 
add: if (target) { lastFocusId=target.id; Wicket.Log.info("focus set on " + lastFocusId); } 
context: 	setFocus: function(event)	{ 		event = Wicket.fixEvent(event);		    // IE doesn't have the property "target".	    // Use "srcElement" instead.	    var target = event.target ? event.target : event.srcElement;		lastFocusId=target.id;		Wicket.Log.info("focus set on " + lastFocusId);	},
meta: 1204	/local1/tlutelli/issta_data/temp/all_js/javascript/2007_temp/2007/1204/785bf2ec45c633fcfab4844280a8da5301298da5/wicket-ajax.js/buggy/jdk-1.4/wicket/src/main/java/org/apache/wicket/ajax/wicket-ajax.js