function ale(func){
	var old_onload = window.onload;
	if(typeof window.onload != 'function'){
		window.onload = func;
	}else{
		window.onload = function(){
			old_onload();
			func();
		}
	}
}

//搜索框处理


//添加序号
function number(){
	var ems = document.getElementsByTagName("em");
	for(var i=0;i<ems.length;i++){
		ems[i].innerHTML = i+1;
	}	
}

//添加加载事件
ale(number);