rem: if(this.observers[i] = observer) 
add: if(this.observers[i].element && (this.observers[i].element == element)) 
context:   removeObserver: function(observer) {    for(var i = 0; i < this.observers.length; i++)      if(this.observers[i] = observer)        this.observers.splice(i,1);  },
meta: 527	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/527/16669774903dd7bfaaf1bf8f0c72e49ebaeffeeb/dragdrop.js/buggy/railties/html/javascripts/dragdrop.js