function update_quantity(){
  qadppro = document.form1.qty_adppro.value;
  qadpwpplugin = document.form1.qty_wpplugin_lite.value;

  var inp=/^[0-5]{1}$/;
  
  if(!inp.test(qadppro))document.form1.qty_adppro.value=0;
  if(!inp.test(qadpwpplugin))document.form1.qty_wpplugin_lite.value=1;
  
  if(document.form1.qty_wpplugin_lite.value==0)document.form1.qty_wpplugin_lite.value=1;
}


function createUrl(str){
  qadppro = document.form1.qty_adppro.value;
  qadpwpplugin = document.form1.qty_wpplugin_lite.value;
  isoptin = document.form1.optin.checked;

  var strmod = str.replace("q=1:0","q=" + qadppro + ":" + qadpwpplugin);
  if(isoptin){
     strmod = strmod.replace("t=optin-no:optin-no","t=optin-yes:optin-yes");
  }
  window.location.href = strmod;
}