function evalString(s) {
	for (i=0;i<s.length;i++) {
		if (!(s.charAt(i) >= 0 && s.charAt(i) <= 9)) {
			temp = s.substring(0, i);
			temp += s.substring(i+1);
			s = temp;
			i--;
		}
	}
	return s;
}

function checkKey(e) {
	return ((e.keyCode >= 48 && e.keyCode <= 57) || (e.keyCode >= 96 && e.keyCode <= 105) || e.keyCode == 8 || e.keyCode == 46 || e.keyCode==37 || e.keyCode==39);
}