change font property on keypress

I have a textbox which by default/design I set to italic and font color  as gray.
I would like to set it to normal and black when I enter data in the textbox.
I could not find a  keypress event.
Also Id  like only characters and no numbers are allowed in it.
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zachvaldezAuthor Commented:
im looking the way the searchbutton works on this page.. look up to the right please.
You are not getting any responses, because you have not posted any code or a link.

guru_samiCommented: textbox doesn't have a built in key events. You will need jquery for that.
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
  <title>Love to marry an free matrimonial website</title>
  <meta name="Generator" content="EditPlus">
  <meta name="Author" content="">
  <meta name="Keywords" content="">
  <meta name="Description" content="">
  <script src=""></script>
    <script type="text/javascript">

  function PressEnter(myfield,e,callback)
       var keycode;
       if (window.event) keycode = window.event.keyCode;
       else if (e) keycode = e.which;
       else return true;

       if (keycode == 13)
         if (callback) {
         return false;
         return true;

function colorChange()
 var field =   $('#testfield');
 field.css({ "color": "black", "font-weight": "normal" });

<form name='frm'>
<input type=text" id="testfield" onkeypress="return PressEnter(this,event,'colorChange()');" style="color:red;font-weight:bold"  >

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