title: autoTab and allowed only numbers
body: <p>is there any easy way of implementing two feature 1) auto tab and 2) allowed only numbers</p>
  
  <p>i have a SSN box below as soon as the user enter three digits will skip to the next .. so on and so forth.....</p>
  
  <pre><code>    &lt;TR&gt;
      &lt;TD nowrap&gt;&lt;b&gt;Social Security Number&lt;/b&gt;&lt;/TD&gt;
      &lt;TD align="left" nowrap colspan="4"&gt;
  &lt;INPUT NAME= "SSN1" TYPE= "TEXT" SIZE= "3" MAXLENGTH= "3" VALUE= ""&gt;
  &lt;INPUT NAME= "SSN2" TYPE= "TEXT" SIZE= "2" MAXLENGTH= "2" VALUE= ""&gt;
  &lt;INPUT NAME= "SSN3" TYPE= "TEXT" SIZE= "4" MAXLENGTH= "4" VALUE= ""&gt;
  &lt;/TD&gt;
      &lt;/tr&gt;
  </code></pre>
  
  <p>also  i wanted to restrict to have only numbers.</p>