function onKeyPressNumFilter(e)
{
	var key = window.event ? e.keyCode : e.which;
	var keychar = String.fromCharCode(key);

	// allow navi+del+backspace	
	if ( key==0 || key==8) return true;
	// deny non numeric chars: 
	reg = /\d/;
	return reg.test(keychar);
}