Form Submit without any button

<form action="xxx" method="POST" name="form1" id="form1"  >
         <input type="hidden" name="clientid" value="<%=clientId%>">
              <input type="hidden" name="amount" value="<%=amount%>">
              <input type="hidden" name="oid" value="<%=oid%>">
              <input type="hidden" name="okUrl" value="<%=okUrl%>" >
              <input type="hidden" name="failUrl" value="<%=failUrl%>" >
              <input type="hidden" name="islemtipi" value="<%=islemtipi%>" >
              <input type="hidden" name="taksit" value="<%=taksit%>">
              <input type="hidden" name="rnd" value="<%=rnd%>" >
              <input type="hidden" name="hash" value="<%=hash%>" >

              <input type="hidden" name="storetype" value="3d_pay_hosting" >

      <input type="submit" name="submit" value="send">