function getCookie(NameOfCookie)
{
	if (document.cookie.length > 0) 
	{
		begin = document.cookie.indexOf(NameOfCookie+"="); 
	    if (begin != -1)
	    {
	    	begin += NameOfCookie.length+1; 
	     	end = document.cookie.indexOf(";", begin);
	      	if (end == -1)
	      		end = document.cookie.length;
	      	return unescape(document.cookie.substring(begin, end));       
		}
	}
	return null; 
}

 

function setCookie(NameOfCookie, value, expiredays) 
{
	var ExpireDate = new Date ();
  	ExpireDate.setTime(ExpireDate.getTime() + (expiredays * 24 * 3600 * 1000));
  	document.cookie = NameOfCookie + "=" + escape(value) + 
  	((expiredays == null) ? "" : "; expires=" + ExpireDate.toGMTString());
}

 

function delCookie (NameOfCookie) 
{
	if (getCookie(NameOfCookie))
	{
  		document.cookie = NameOfCookie + "=" + "; expires=Thu, 01-Jan-70 00:00:01 GMT";
	}
}