function getCookie(name) {
// return string containing value of specified cookie or null if cookie does not exist
var dc = document.cookie;
var prefix = name + "=";
var begin = dc.indexOf("; " + prefix);
if (begin == -1) {
begin = dc.indexOf(prefix);
if (begin != 0) return null;
} else
begin += 2;
var end = document.cookie.indexOf(";", begin);
if (end == -1)
end = dc.length;
return unescape(dc.substring(begin + prefix.length, end));
}
function deleteCookie(name, path, domain) {
if (getCookie(name)) {
	//alert(getCookie(name));
	document.cookie = name + "=" + "; expires=Thu, 01-Jan-70 00:00:01 GMT";
/*
document.cookie = name + "=" + 
((path) ? "; path=" + path : "") +
((domain) ? "; domain=" + domain : "") +
"; expires=Thu, 01-Jan-70 00:00:01 GMT";
*/
}
} 
function setCookie(name, value) 
{
	//alert(name)
	//alert(value)
	deleteCookie(name, "", "");
	var expiryDays = 1000*24*60*60*1000;
	// I want the cookie to expire after 100 days, you can change this value
	var exp = new Date(); 
	exp.setTime(exp.getTime() + (expiryDays));
	var expiry =  exp.toGMTString();
	if (value != null && value != "")
	{
		document.cookie=name + "=" + escape(value) + "; expires=" + expiry;
	}
}