function getCookie(sName) {
	var aCookie = document.cookie.split("; ");
	for (var i = 0; i < aCookie.length; i++) {
		var nvp = aCookie[i].split("=");
		if (sName == nvp[0])
			return unescape(nvp[1]);
	}
	return null;
}
function setCookie(sName, sValue) {
	var expires = new Date();
	expires.setTime(expires.getTime() + 1000*60*60*24*365*10);
	document.cookie = sName + "=" + escape(sValue) + "; expires=" + expires.toGMTString();return sValue;
	
}
function clearCookie(sName, sValue) {
	document.cookie = sName + "=" + escape(sValue) + "; expires=-1";
}