var xmlHttp;
function creatXMLHttp()
{
   if(window.ActiveXObject)
   {
       xmlHttp=new  ActiveXObject("Microsoft.XMLHTTP");
   }
   else if(window.XMLHttpRequest)
   {
      xmlHttp=new XMLHttpRequest();
   }
}
creatXMLHttp();
function obj_ajax(urlParam,urlStr,fun)
{    
    xmlHttp.open("POST", urlStr, true);  
    xmlHttp.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");
    xmlHttp.onreadystatechange=fun;
    xmlHttp.send(urlParam); 
}

//添加Cookie
function addCookie(name,value,expireHours)
{
    deleteCookie(name);
    var cookieString=name+"="+value;
    //判断是否设置过期时间
    if(expireHours>0)
    {
         var date=new Date();
         date.setTime(date.getTime+expireHours*3600*1000);
         cookieString=cookieString+"; expire="+date.toGMTString();
    }
    document.cookie=cookieString;
}
//获取Cookie
function getCookie(name)
{
    var strCookie=document.cookie;
    var arrCookie=strCookie.split("; ");
    for(var i=0;i<arrCookie.length;i++)
    {
         var arr=arrCookie[i].split("=");
         if(arr[0]==name)return arr[1];
    }
    return "";
}
//删除Cookie
function deleteCookie(name)
{
    var date=new Date();
    date.setTime(date.getTime()-10000);
    document.cookie=name+"=; expire="+date.toGMTString();
}