var isIE = document.all?true:false;
var isNS = document.layers?true:false;

function onlyDigits(e) {
	var _ret = true;
	if (isIE) {
	if (window.event.keyCode < 46 || window.event.keyCode > 57) {
		window.event.keyCode = 0;
		_ret = false;
	}
}

if (isNS) {
if (e.which < 46 || e.which > 57) {
e.which = 0;
_ret = false;
}

}
return (_ret); 
}