Preventing Users From Entering Non-numeric Characters?

Dec 29, 2010

I have the following code that i am using to try and prevent users from entering non-numeric characters but it doesn't seem to work:

PHP Code:
function validate_onkeypress() {
a = String.fromCharCode(event.keyCode);
b = a.charCodeAt(0);
if (!validateString(b)) return false;

[Code]...

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var u=document.forms["lead"]["name"].value;
var v=document.forms["lead"]["city"].value;
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[Code]...

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--------------------
All of our purchase orders are saved back to pdf files. Each pdf has the
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Code:
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