title: Only Allow Numbers to be Typed in Input Field
body: <p>I'd like to have the phone number field on <a href="http://myfrugaltech.com/dev/savoo/register/" rel="nofollow">this website</a> only accept numbers or digits. I do not have access to edit the HTML code, so can this be done with jQuery by targeting the field's ID? If so, how can it be done?</p>
  
  <p>I've already tried a few suggestions on this site and none have worked so far.</p>
  
  <p>Thanks in advance for any assistance!</p>