function createCookie(name, value, hours) 
{
	if (hours) 
	{
		var date = new Date();
		date.setTime(date.getTime() + (hours * 60 * 60 * 1000));
		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);
}