function std_switch(arg0){
	for(var i=1;i<=6;i++){
		document.getElementById("stdtb"+i).style.background="url(/IMGFile/index/huodongmen/"+i+(arg0==i?"_over":"")+".gif)";
		document.getElementById("stdc"+i).style.display=(arg0==i?"block":"none");
	}	
}