function numbersonly(e, decimal) {
	var key;
	var keychar;
		if (window.event) {
			key = window.event.keyCode;
		}
		else if (e) {
			key = e.which;
		}
		else {
			return true;
		}
			keychar = String.fromCharCode(key);

		if ((key==null) || (key==0) || (key==8) ||  (key==9) || (key==13) || (key==27) ) {
			return true;
		}
		else if ((("0123456789").indexOf(keychar) > -1)) {
			return true;
		}
		else if (decimal && (keychar == ".")) { 
			return true;
		}
		else
			return false;
		}