function Tracing(){
		var width = '300px';
		var height = '100%';
		var left = '800px';
		var top = '0px';
		var bg = 'white';
		var position = 'absolute';
		var list;
		function start(){			
			var div = document.createElement('div');
			list = document.createElement("select");
			list.multiple = "true";
			list.style.borderStyle = 'solid';
			list.style.borderWidth = '1px';
			list.style.borderColor = 'black';
			list.style.width = width;
			list.style.height = height;
			
			div.appendChild(list);
			div.style.width = width;
			div.style.height = height;
			div.style.left = left;
			div.style.top = top;
			div.style.position = position;
			div.style.backgroundColor = bg;
			document.body.appendChild(div);
		}
		function write(msg){
			var newOption = new Option();
			newOption.text = msg;
			newOption.value = msg;
			list.options.add(newOption);		
		}		
		this.Start = start;
		this.Write = write;
}