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);
}

function onKeyPressCharFilter(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;
	// allow en characters end nums (starts with letter)
	reg = /[a-z]/;
	return reg.test(keychar);
}