findElement: function(event, tagName) { 
findElement: function(event, expression) { 
  findElement: function(event, tagName) {    var element = Event.element(event);    while (element.parentNode && (!element.tagName ||        (element.tagName.toUpperCase() != tagName.toUpperCase())))      element = element.parentNode;    return element;  },
4053	/local1/tlutelli/issta_data/temp/all_js/javascript/2007_temp/2007/4053/37a06e5ed1bdb861348bb0cfd02f71470a0dfdfb/prototype.js/clean/lib/prototype.js