$(document).ready(function(){

 $('a.terms').click(function(){
  window.open("/terms",'terms-window','status=0,menubar=0,toolbar=0,resizable=1,scrollbars=1,height=600,width=400');
 });

checkTerms = function(){
  if($('#terms_agree:checked').val() != 'y'){
     $('form[name=product_form] input[type=submit]').attr('disabled','disabled');
     $('.terms-box').addClass('check-terms');
  }else{
     $('form[name=product_form] input[type=submit]').removeAttr('disabled');
     $('.terms-box').removeClass('check-terms');
  }
 }

 if($('a.terms').length != 0) {
 checkTerms();
 $('#terms_agree').change(function(){ checkTerms(); });
 }

});