How to restrict the text field to enter only numbers???

I have used "onkeyup" event to call a function "test", I am getting the alert message for every entry (even for a number), I dont know why I am getting this. Please help me out.....
Number1 : <input type="text" name="myin1" id="a" onkeyup="test(this,event)">
function test(ff,evt)
evt = (evt) ? evt : event;
var charCode = (evt.charCode) ? evt.charCode : ((evt.keyCode) ? evt.keyCode :
((evt.which) ? evt.which : 0));
if (charCode > 31 && (charCode < 48 || charCode > 57)) {
alert("Only numbers are allowed"); }
}

Hi,
However this is java forum and you are asking for a solution of a javascript problem,
I think I got the problem.
This script works fine when I run it on IE and use the numeric keys above the text keys,
but give error when I use the numerical keypad on the right.
I think you should change your if condition like this
if (charCode > 31 && ((charCode < 48 || charCode > 57) || (charCode < 96 || charCode > 105)) {

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