function setOnloadEvent(func){
 var oldonload = window.onload;
 if(typeof window.onload != "function"){
  window.onload = func;
 }
 else{
    window.onload = function(){
     oldonload();
     func();
    }
 }
}
// --- 设置cookie
function setCookie(name,value,days) {
  if (days) {
    var date = new Date();
    date.setTime(date.getTime()+(days*24*60*60*1000));
    var expires = "; expires="+date.toGMTString();
  }
  else expires = "";
  document.cookie = name+"="+value+expires+"; path=/";
}
//--- 获取cookie
function getCookie(name) {
  var nameEQ = name + "=";
  var ca = document.cookie.split(';');
  for(var i=0;i < ca.length;i++) {
    var c = ca[i];
    while (c.charAt(0)==' ') c = c.substring(1,c.length);
    if (c.indexOf(nameEQ) == 0) return c.substring(nameEQ.length,c.length);
  }
  return null;
}
	
function skin(){
	var skin_id="green"; //默认的CSS文件
	if(getCookie("skinid")!=null){
		skin_id = getCookie("skinid");
	}
	setskin(skin_id);
}

function setskin(skinid){
	if(!document.getElementsByTagName) return false;
	if(!document.getElementById("skin")) return false;
	document.getElementById("skin").href = "/v3/css/" + skinid + ".css"; //可是 skin.href = "/css/" + skinid + ".css" 
	setCookie("skinid",skinid,1);
}

setOnloadEvent(skin);