/* check the functionality of their machine/browser
	    to decide how to calculate the dates they have entered,
		for compatibility reasons */
	function machineCheck() {
		if(navigator.platform.substring(navigator.platform.indexOf("M"), navigator.platform.indexOf("M")+3).toUpperCase() == "MAC" || navigator.userAgent.indexOf("Opera") != -1) {
			return false;
		}
		else {
			return true;
		}
	}