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

	function get_cookie(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 unset_cookie(name)
	{
		set_cookie(name,"",-1);
	}