rem: return null; 
add: this.done(); return false; 
context: 	doGet: function() {		if (this.precondition()) {				this.transport = Wicket.Ajax.getTransport();					var url = this.createUrl();				this.log("GET", url);						Wicket.Ajax.invokePreCallHandlers();						var t = this.transport;			if (t != null) {				t.open("GET", url, this.async);				t.onreadystatechange = this.stateChangeCallback.bind(this);				// set a special flag to allow server distinguish between ajax and non-ajax requests				t.setRequestHeader("Wicket-Ajax", "true");				t.send(null);				return true;			} else {				this.failure();	       		return false;			}		} else {			return null;		}	},
meta: 1204	/local1/tlutelli/issta_data/temp/all_js/javascript/2007_temp/2007/1204/a4d7cea1c50c6640e124518af93afa2e14ca3220/wicket-ajax.js/clean/jdk-1.4/wicket/src/main/java/org/apache/wicket/ajax/wicket-ajax.js