function $(obj){return document.getElementById(obj);}
function showlist(obj){
	for(var i = 1;i <= 4; i++){
		for(var k=0;k<$("list_"+i).getElementsByTagName("dd").length;k++){
			if(obj.id == "list_"+i){
				obj.getElementsByTagName("dd")[k].className = "open";
			}else{
				$("list_"+i).getElementsByTagName("dd")[k].className = "close";
			}
		}
	}
}