I use this frmvalidator, together with a php script that insert my form results in a xls file,

i need to have the checkbox validated, it have to be checked to submit the form.. But im stuck, how do I set the codes..
:

Code:
<script language="JavaScript" type="text/javascript">
 var frmvalidator = new Validator("nettskjema");
 
 
  frmvalidator.addValidation("a","req");
 frmvalidator.addValidation("a","maxlen=100");
 frmvalidator.addValidation("a","a");
 
 frmvalidator.addValidation("b","req");
 frmvalidator.addValidation("b","maxlen=100");
 frmvalidator.addValidation("b","b");
 
 frmvalidator.addValidation("c","req");
 frmvalidator.addValidation("c","maxlen=100");
 frmvalidator.addValidation("c","c");


 
  frmvalidator.addValidation("ACCEPT","req");
  frmvalidator.addValidation("ACCEPT","shouldselchk");
 frmvalidator.addValidation("ACCEPT","ACCEPT");
 
</script>
http://www.javascript-coder.com/html...lidation.phtml