function createCookie(name, value, domain, days)
{
	if (days)
	{
		var date = new Date();		
		date.setTime(date.getTime()+(days*24*60*60*1000));
		var expires = "; expires="+date.toGMTString();
	}
	else var expires = "";
	
	var cookie = name+"="+Encrypt(value)+expires +
		( (domain) ? "; domain=" + domain : "") +
		"; path=/";
	 document.cookie = cookie;
}

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 Decrypt(c.substring(nameEQ.length,c.length));
	}
	return null;
}

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

function Encrypt(theText)
{
	if(theText == null)
		return "";
	
	var enc = "";
	for (i = 0; i < theText.length; i++) {
		enc += theText.charCodeAt(i) + "_";
	}
	return enc;
}

function Decrypt(theText)
{
	if(theText == null)
		return "";
		
	var dec = "";
	var charCodes = theText.split('_');
	for (i = 0; i < charCodes.length - 1; i++) {
		dec += String.fromCharCode(charCodes[i]);
	}
	return dec;
}