rem: f(xmlhttp.responseXML, url); 
add: try { f(xmlhttp.responseXML, url); } finally { tl.hideLoadingMessage(); } 
context:     var fDone = function(xmlhttp) {        f(xmlhttp.responseXML, url);    };
meta: 4232	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/4232/6eecb6a63f20551084335a2ba3ce689361931c1f/timeline.js/buggy/src/main/webapp/api/scripts/timeline.js