Hi there Grizz,

here is my possible solution to your problem...
Code:
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN"
   "http://www.w3.org/TR/html4/strict.dtd">
<html lang="en">
<head>

<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<meta name="language" content="english"> 
<meta http-equiv="Content-Style-Type" content="text/css">
<meta http-equiv="Content-Script-Type" content="text/javascript">

<title>check inputs for numbers</title>

<style type="text/css">
#table1 {
    float:left;
    clear:left;
    width:300px;
    border:1px outset #666;
    margin-bottom:10px;
 }
#table1 td {
    padding:3px;
    border:1px inset #666;
    text-align:center;
 }
#but {
    clear:both;
    display:block;
 }
.indicate{
    border-style:solid;
    border-color:#f00;
 }
</style>

<script type="text/javascript">

function init() {

document.getElementById('but').onclick=function() {

   nf=[];
   inps=document.getElementById('table1').getElementsByTagName('input');

for(c=0;c<inps.length;c++) {

   inps[c].className='';

if((inps[c].value=='')||(isNaN(inps[c].value))) {

   inps[c].className='indicate';   
   nf.push(c+1);

  }
 }

if(nf!='') {

   alert('input(s)...\n\n'+nf+'\n\n...require your attention');

   }
  }
 }
   window.addEventListener?
   window.addEventListener('load',init,false):
   window.attachEvent('onload',init);
</script>

</head>
<body>

<div>

<table id="table1"><tr>
<td><input type="text" size="1" name="group1"></td>
<td><input type="text" size="1" name="group2"></td>
<td><input type="text" size="1" name="group3"></td>
<td><input type="text" size="1" name="group4"></td>
<td><input type="text" size="1" name="group5"></td>
<td><input type="text" size="1" name="group6"></td>
</tr><tr>
<td><input type="text" size="1" name="group1"></td>
<td><input type="text" size="1" name="group2"></td>
<td><input type="text" size="1" name="group3"></td>
<td><input type="text" size="1" name="group4"></td>
<td><input type="text" size="1" name="group5"></td>
<td><input type="text" size="1" name="group6"></td>
</tr><tr>
<td><input type="text" size="1" name="group1"></td>
<td><input type="text" size="1" name="group2"></td>
<td><input type="text" size="1" name="group3"></td>
<td><input type="text" size="1" name="group4"></td>
<td><input type="text" size="1" name="group5"></td>
<td><input type="text" size="1" name="group6"></td>
</tr></table> 
<input id="but" type="button" value="check">
</div>

</body>
</html>