var numbers = '1234567890'
function numbersOnly(e) {
    
    //alert('numbersOnly');
    var k;
    k = document.all ? parseInt(e.keyCode) : parseInt(e.which);
    //alert(numbers.indexOf(String.fromCharCode(k)) != -1);
    return (numbers.indexOf(String.fromCharCode(k)) != -1);
}