function getCookie(name)
{ 
	var position;
	var token = name + "=";
	var tokenlength = token.length;
	var cookielength = document.cookie.length;
	var i = 0;
	var j;
	while (i < cookielength){
		j = i + tokenlength;
		if (document.cookie.substring(i, j) == token){ 
			position = document.cookie.indexOf (";", j);
			if (position == -1)
				position = document.cookie.length;
			return unescape(document.cookie.substring(j, position));
		}
		i = document.cookie.indexOf(" ", i) + 1;
		if (i == 0) break;
	} //End While
	return null;
}

function setCookie(name, value)
{ 
	document.cookie = name + "=" + escape(value)
}

function deleteCookie(name)
{ 
	var expiredate = new Date();
	expiredate.setTime (expiredate.getTime() - 1);
	var cookievalue = getCookie (name);
	document.cookie = name + "=" + cookievalue + "; expires=" + expiredate.toGMTString();
}