function changebackImg(obj,id){
	var backgroundImg = "";
	if(obj.id=="headbar"){
	backgroundImg = "url('/help/images/lmenubar.png')";
	}else if(obj.id=="endbar"){
	backgroundImg = "url('/help/images/rmenubar.png')";
	}else{
	backgroundImg = "url('/help/images/mmenubar.png')";
	}
	obj.style.backgroundImage = backgroundImg;
	$("#"+id).css("color","#ffffff");
}

function reback_style(obj,id){
	obj.style.backgroundImage = "";
	//alert(isOrNotThis);
	//if(isOrNotThis==null){
	//	return false;
	//}
	if(isOrNotThis==null||(isOrNotThis!=null&&id!=isOrNotThis)){
	$("#"+id).css("color","#000000");
	}

}