I found this answer before, to fire an alert if the button is pressed but the checkbox isn't checked.

Why won't this work?

<input value="1"  type="checkbox" name="salgsvilkar" ID="checkbox2"  style="float:left;"
       onclick="document.getElementById('scrollwrap').style.cssText='border-color:#85c222; background-color:#E5F7C7;';" /><label for="checkbox2" class="akslabel">Salgs og leveringsvilkår er lest og akseptert</label>
        </span>

         {literal}
            <script type="text/javascript">
$(function() {
   //checkbox
   $("#checkbox2").click(function(){
       //if this...
       //alert("this")...
       if($("#checkbox2").is(':checked'))
       {              
          alert("im checked");
       }
   });
   //button
   $("#fullfor_btn").click(function(e){
       if(!$("#checkbox2").is(':checked'))
       {
           alert("you did not check the agree to terms..."); 
           e.preventDefault();
       }
   });
 }
</script>
  {/literal}

This on another .tpl:

<label></label>
        <button type="submit" class="submit" name="{$method}" id="fullfor_btn" title="Fullfør bestillingen nå" value="">&nbsp;</button>

What could be going wrong? The jQuery doesn't fire anything at all.