title: Allow only numbers in JavaScript
body: <blockquote>
    <p><strong>Possible Duplicate:</strong><br>
    <a href="https://stackoverflow.com/questions/469357/html-text-input-allow-only-numeric-input">HTML Text Input allow only Numeric input</a>  </p>
  </blockquote>
  
  
  
  <p>I used this script</p>
  
  <pre><code>function isNumberKey(evt)
    {
      var e = event || evt; // for trans-browser compatibility
      var charCode = e.which || e.keyCode;                        
      if (charCode &gt; 31 &amp;&amp; (charCode &lt; 47 || charCode &gt; 57))
      return false;
      if (e.shiftKey) return false;
      return true;
   }
  </code></pre>
  
  <p>But this script not working in firefox alone.
  Any alternatives to restrict user for shift key in javascript?</p>