function addCookie(name,value,expires,path,domain){
	var str=name+"="+escape(value);
	if(expires!=""){
		var date=new Date();
		date.setTime(date.getTime()+expires*24*3600*1000);//expires单位为天
		str+=";expires="+date.toGMTString();
	}
	if(path!=""){
	str+=";path="+path;//指定可访问cookie的目录
	}
	if(domain!=""){
	str+=";domain="+domain;//指定可访问cookie的域
	}
	document.cookie=str;
}
//取得cookie
function getCookie(c_name){
  if (document.cookie.length>0){
    var c_start=document.cookie.indexOf(c_name + "=");
    if (c_start!=-1){ 
	    c_start=c_start + c_name.length+1 ;
	    var 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 "";

}
//删除cookie
function delCookie(name){
	var date=new Date();
	date.setTime(date.getTime()-10000);
	document.cookie=name+"=;expire="+date.toGMTString();
}