function force_to_numeric(e)
{
	var key = e.charCode || e.keyCode || 0;
	// allow backspace, tab, delete, arrows, numbers and keypad numbers ONLY, and ENTER
	return (
		e.keyCode == 13 || 
		key == 8 || 
		key == 9 ||
		key == 46 ||
		(key >= 37 && key <= 40) ||
		(key >= 48 && key <= 57) ||
		(key >= 96 && key <= 105));
}