function SetCookie(c_name,value,milliseconds)
{ 
    var exdate=new Date()
    var expiredays=milliseconds;
     
    exdate.setMilliseconds(exdate.getMilliseconds()+expiredays);
    document.cookie=c_name+ "=" +escape(value)+
    ((expiredays==null) ? "" : ";expires="+exdate.toGMTString())+";path=/"
    
 
  
}


//function SetCookie(c_name,value)
//{
//var exdate=new Date()
//var expiredays=1;
//exdate.setDate(exdate.getDate()+expiredays)
//document.cookie=c_name+ "=" +escape(value)+
//((expiredays==null) ? "" : ";expires="+exdate.toGMTString())+";path=/"
//}



function GetCookie(c_name)//取cookies函数        
{
    if (document.cookie.length>0)
      {
      c_start=document.cookie.indexOf(c_name + "=")
      if (c_start!=-1)
        { 
        c_start=c_start + c_name.length+1 
        c_end=document.cookie.indexOf(";",c_start)
        if (c_end==-1) c_end=document.cookie.length
        return unescape(document.cookie.substring(c_start,c_end))
        } 
      }
    return ""


}
function delCookie(name)//删除cookie
{
    var exp = new Date();
    exp.setTime(exp.getTime() - 1);
    var cval=getCookie(name);
        if(cval!=null) document.cookie= name + "="+cval+";expires="+exp.toGMTString();
}