function set_cookie(name, value, days)
{
	if (days)
	{
		date = new Date();
		date.setTime(date.getTime() + (days * 24 *3600 * 1000));
		expires = '; expires=' + date.toGMTString();
	}
	else
	{
		expires = '';
	}
	
	document.cookie = name + "=" + value + expires + '; path=/';
}

function get_cookie(name)
{
	nameEQ = name + "=";
	ca = document.cookie.split(';');
	for (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 delete_cookie(name)
{
	set_cookie(name, null, -1);
}