Pass Variables To Level 1

<select class="Large" name="opportunitytypeid" id="opportunitytypeid">

 <option value="0">--Select One--</option>
 <option value="11608">Beginning Years</option>
 <option value="11607">Healthy Active Children</option>
 <option value="11603">Diabetes</option>
 </select>
 <script>
 function createForm(){
    var oppID=document.getElementById('opportunitytypeid').value;
    if(oppID=="0"){
         alert("Please select a template");return false;}

     parent.location.href='/Apps/app_editopportunity.jsp?appid=@system.appID@&nextlevel=1&opportunityid=0&companyid=@companyid@&defaultownerid=@userid@&opportunitytypeid='+oppID;
 }
 </script>
 <input type=button class=Button onclick="createForm()" value="Create Form"/>