rem: Element.Class.add(drop.element, drop.hoverclass); 
add: Element.addClassName(drop.element, drop.hoverclass); 
context:   activate: function(drop) {    if(this.last_active) this.deactivate(this.last_active);    if(drop.hoverclass)      Element.Class.add(drop.element, drop.hoverclass);    this.last_active = drop;  },
meta: 3974	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/3974/af9adbf17404d887f31369756326b0109da7ae2b/dragdrop.js/buggy/root/static/js/dragdrop.js