var nav4 = window.Event ? true : false;
function acceptNumOld(evt){	
// NOTE: Backspace = 8, Enter = 13, '0' = 48, '9' = 57	
var key = nav4 ? evt.which : window.event.keyCode;
alert(key);	
return (key <= 13 || (key >= 48 && key <= 57));
}


function acceptNum(e) {
	var keycode;
	if (window.event) keycode = window.event.keyCode;
	else if (e) keycode = e.which;
	return (keycode <= 13 || (keycode >= 48 && keycode <= 57));
}