//crea o riscrive un cookie
function CreateCookie(name, value)
{
	var expires = false;

	var expireDate = new Date();
	var expireString = "";
	expireDate.setTime(expireDate.getTime() + (1000*60*60*24*365));
	expireString = "expires="+expireDate.toGMTString();
	top.document.cookie = name+"="+escape(value)+";"+(expires ? expireString+";" : "");
}

//ritorna il valore di un cookie
function GetCookie(name)
{
	var value = null;
	var myCookie = top.document.cookie+";";
	var findName=name+"=";
	var endPos;
	if(myCookie.length > 0)
	{
		var beginPos = myCookie.indexOf(findName);
		if(beginPos != -1)
		{
			beginPos = beginPos + findName.length;
			endPos = myCookie.indexOf(";", beginPos);
			if(endPos == -1)
				endPos = myCookie.length;
			value = unescape(myCookie.substring(beginPos, endPos));
		}
	}

	return value;
}