function createCookie(name, value, days)
{
	if (days)
	{
		var date=new Date();
		date.setTime(date.getTime()+(days*86400000));
		var expires="; expires="+date.toGMTString();
	}
	else
	{
		var expires="";
	}
	document.cookie=name+"="+value+expires+"; path=/";
}

function readCookie(name)
{
	var nameEQ=name+"=";
	var ca=document.cookie.split(";");
	for (var i=0; i<ca.length; i++)
	{
		var 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);
}