/// http://www.echoecho.com/jscookies02.htm //

function getCookie(NameOfCookie)
{
		// First we check to see if there is a cookie stored.
		// Otherwise the length of document.cookie would be zero.
		
		if (document.cookie.length > 0) 
		{ 
		
		// Second we check to see if the cookie's name is stored in the
		// "document.cookie" object for the page.
		
		// Since more than one cookie can be set on a
		// single page it is possible that our cookie
		// is not present, even though the "document.cookie" object
		// is not just an empty text.
		// If our cookie name is not present the value -1 is stored
		// in the variable called "begin".
		
		begin = document.cookie.indexOf(NameOfCookie+"="); 
		if (begin != -1) // Note: != means "is not equal to"
		{ 
		
		// Our cookie was set. 
		// The value stored in the cookie is returned from the function.
		
		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; 
		
		// Our cookie was not set. 
		// The value "null" is returned from the function.
}


function setCookie(NameOfCookie, value, expiredays) 
{
		// Three variables are used to set the new cookie. 
		// The name of the cookie, the value to be stored,
		// and finally the number of days until the cookie expires.
		// The first lines in the function convert 
		// the number of days to a valid date.
		
		var ExpireDate = new Date ();
		ExpireDate.setTime(ExpireDate.getTime() + (expiredays * 24 * 3600 * 1000));
		
		// The next line stores the cookie, simply by assigning 
		// the values to the "document.cookie" object.
		// Note the date is converted to Greenwich Mean time using
		// the "toGMTstring()" function.
		
		document.cookie = NameOfCookie + "=" + escape(value) + 
		((expiredays == null) ? "" : "; expires=" + ExpireDate.toGMTString());
} 



function delCookie (NameOfCookie) 
{
		// The function simply checks to see if the cookie is set.
		// If so, the expiration date is set to Jan. 1st 1970.
		
		if (getCookie(NameOfCookie)) {
		document.cookie = NameOfCookie + "=" +
		"; expires=Thu, 01-Jan-70 00:00:01 GMT";
		}
}