//切换标题栏背景
function change_title_bg(ojb_id,img_url){
	document.getElementById(ojb_id).style.backgroundImage="url("+img_url+")";
}

//切换内容(修改display属性)
function change_style_display(show_id,hidden_id){
	document.getElementById(show_id).style.display="";
	var tmp=hidden_id.split(",");
	var i
	for (i=0;i<tmp.length;i++){
		document.getElementById(tmp[i]).style.display="none";
	}
}