function createCookie(name,value,days)
{
	var expires;
	var date;

	if (days)
	{
		date = new Date();
		date.setTime(date.getTime()+(days*86400000));	// 24*60*60*1000
		expires = "; expires="+date.toGMTString();
	}
	else
		expires = "";
	
	document.cookie = name+"="+value+expires+"; path=/";
}

function readCookie(name)
{
	var nameEQ;
	var ca;
	var c;

	nameEQ = name + "=";
	ca = document.cookie.split(';');

	for (var i=0; i < ca.length; i++)
	{
		c = ca[i];

		while (c.charAt(0) == ' ')
			c = c.substring(1,c.length);

		if (c.indexOf(nameEQ) == 0)
			return c.substring(nameEQ.length,c.length);
	}

	return null;
}

function eraseCookie(name)
{
	createCookie(name,"",-1);
}