function setCookie(whichName,whichValue,daysUntilExpiration) {
	if(daysUntilExpiration == null) daysUntilExpiration=30;
	// 30 days is default value
	var cookieExpDate = new Date((new Date()).getTime() + (1000*60*60*24*daysUntilExpiration));
	var cookieContent = whichName + "=" + whichValue +'; expires=' + cookieExpDate.toGMTString()+';';
	document.cookie = cookieContent;
}

function getCookie(whichName){
	var cookieContent = document.cookie;
	var pos = cookieContent.indexOf(whichName);
	var start = pos + whichName.length + 1;
	var end = cookieContent.indexOf(";",start);
	if(end == -1) end = cookieContent.length;
	var whichValue = cookieContent.substring(start,end);
	return whichValue;
}