function getCookie(c_name)
	{
		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 "";
	}
	
	//Ham Ghi Cookie
	function setCookie(c_name,value,expiredays)
	{
		var exdate=new Date();
		exdate.setDate(exdate.getDate()+expiredays)
		document.cookie=c_name+ "=" +escape(value)+
		((expiredays==null) ? "" : ";expires="+exdate.toGMTString())
	}
	//luu cookie
	function SaveCookie(CookieName,Value)
	{
		//ArrCode:La Ten Cookies ghi xuong Client trong 10 ngay
		if (Value!=null && Value!="")
			setCookie(CookieName,Value,10)
	}
	 function delete_cookie ( cookie_name )
        {
          var cookie_date = new Date ( );  // current date & time
          cookie_date.setTime ( cookie_date.getTime() - 1 );
          document.cookie = cookie_name += "=; expires=" + cookie_date.toGMTString();
        }