RHANDOM / CGI-Ex-2.11 / samples / js_validate_3.html 
<html>
<style>
.error {
  color: red;
  font-size: 75%;
}
</style>

<script src="../lib/CGI/Ex/yaml_load.js"></script>
<script src="../lib/CGI/Ex/validate.js"></script>
<script src="./yaml_load.js"></script>
<script src="./validate.js"></script>
<script>
if (! document.yaml_load) {
  document.writeln('<span style="color:red"><h1>Missing document.yaml_load</h1>Path to ../lib/CGI/Ex/yaml_load.js may be invalid.</span>');
} else {
  document.writeln('<span style="color:green"><h1>Found document.yaml_load</h1></span>');
}

if (! document.validate) {
  document.writeln('<span style="color:red"><h1>Missing document.validate</h1>Path to ../lib/CGI/Ex/validate.js may be invalid.</span>');
} else {
  document.writeln('<span style="color:green"><h1>Found document.validate</h1></span>');
}

</script>


<form name=a validation="
general no_confirm: 1
general no_alert: 1
general as_array_prefix: ' -- '
">
<table>
<tr>
  <td valign=top>Enter a date (YYYY/MM/DD) greater than today:<br>
    (<script>var t=new Date();document.writeln(t.toGMTString())</script>)
  </td>
  <td>
    <input type=text size=20 name=date validation="
 name: Date
 required: 1
 match: 'm|^\d\d\d\d/\d\d/\d\d$|'
 match_error: 'Please enter date in YYYY/MM/DD format'
 custom_js: |
   var t=new Date();
   var y=t.getYear()+1900;
   var m=t.getMonth() + 1;
   var d=t.getDate();
   if (m<10) m = '0'+m;
   if (d<10) d = '0'+d;
   (value > ''+y+'/'+m+'/'+d) ? 1 : 0;
 custom_js_error: The date was not greater than today.
"><br>
    <span id=date_error class=error></span>
  </td>
</tr>
<tr>
  <td colspan=2 align=right>
    <input type=submit>
  </td>
</tr>
</table>
</form>

<script src="../lib/CGI/Ex/yaml_load.js"></script>
<script src="../lib/CGI/Ex/validate.js"></script>
<script>
if (document.check_form) document.check_form('a');
</script>

</html>