}

	        available.options.length = 0;

	    }

	    //remove all elements

	    if(this.id=='remove_all_elements'){

	        for(var i=0; node = chosen.options[i];i++){

	            available.appendChild(new Option(node.text,

	                    node.value, false, false));

	        }

	        chosen.options.length = 0;

	    }

	}

	YUE.addListener(['add_element','remove_element',

	               'add_all_elements','remove_all_elements'],'click',

	               prompts_action_callback)

	if (form_id !== undefined) {

		YUE.addListener(form_id,'submit',function(){

		    var chosen = YUD.get(selected_container);

		    for (var i = 0; i < chosen.options.length; i++) {

		        chosen.options[i].selected = 'selected';

		    }

		});

	}

}

// global hooks after DOM is loaded

YUE.onDOMReady(function(){

	YUE.on(YUQ('.diff-collapse-button'), 'click', function(e){

		var button = e.currentTarget;

		var t = YUD.get(button).getAttribute('target');

	    console.log(t);

		if(YUD.hasClass(t, 'hidden')){

			YUD.removeClass(t, 'hidden');

			YUD.get(button).innerHTML = "↑ {0} ↑".format(_TM['Collapse diff']);

		}

		else if(!YUD.hasClass(t, 'hidden')){

			YUD.addClass(t, 'hidden');

			YUD.get(button).innerHTML = "↓ {0} ↓".format(_TM['Expand diff']);

		}

	});

});