if(!GuiPack) {

	var GuiLib = Class.create();	
	
	GuiLib.prototype = {
		
		initialize: function() {
			
		},
		
		getScrollbarWidth: function() {
			/* FIX dit moet een functie van GuiPack worden*/
			var inner = Builder.node('p');	
			$(inner).setStyle({width: '100%', height: '200px'});
			
			var outer = Builder.node('div');
			$(outer).setStyle({position: 'absolute', top: '0px', left: '0px', visibility: 'hidden', width: '200px', height: '150px', overflow: 'hidden'});
			outer.appendChild(inner);
			
			document.body.appendChild (outer);
			var w1 = inner.offsetWidth;
			outer.setStyle({overflow: 'scroll'});
			var w2 = inner.offsetWidth;
			if (w1 == w2) {
				w2 = outer.clientWidth;
			}			
			document.body.removeChild(outer);
			
			return (w1 - w2);
		}
	};
	
	var GuiPack = new GuiLib();
};