$("fLeft").onmouseover = function(){
	if($("tghelper")){
		this.className = "left";
		$("fRight").className = "right";
		$("tghelper").style.display = "";
		$("zhaos").style.display = "none";
	}
}
$("fRight").onmouseover = function (){
	if($("zhaos")){
		this.className = "right_relNow";
		$("fLeft").className = "left_rel";
		$("zhaos").style.display = "";
		$("tghelper").style.display = "none";
	}
}