isLeftClick: function(event) { return (((event.which) && (event.which == 1)) || ((event.button) && (event.button == 1))); }, 
isLeftClick:   function(event) { return isButton(event, 0) }, 
  isLeftClick: function(event) {    return (((event.which) && (event.which == 1)) ||            ((event.button) && (event.button == 1)));  },
6462	/local1/tlutelli/issta_data/temp/all_js/javascript/2007_temp/2007/6462/0097375444aef03d8cdcdbe6705c1ea088b9b188/prototype.js/clean/wp-includes/js/scriptaculous/prototype.js