function radio_selected(radiobutton) {
 for (i = 0; i < radiobutton.length; i++) {
  if (radiobutton[i].checked) {
   return true;
  }
 }
 return false;
}
function radio_selected_extra(radiobutton, extrafield)
{
 for (i = 0; i < radiobutton.length - 1; i++) {
  if (radiobutton[i].checked) {
   return true;
  }
 }
 if (radiobutton[i].checked && extrafield.value) {
  return true;
 }
 return false;
}
function checkbox_selected(checkbox, tr, rl, rh, ve, extrafield) {

 var tc = 0;

 for (i = 0; i < checkbox.length - 1; i++) {
  if (checkbox[i].checked) {
   tc++;
  }
 }
 
 if (checkbox[i].checked) {
  tc++;
  if (ve == 1 && !extrafield.value) {
   return false;
  }
 }

 if (tr == 1 && tc >= rl) {
  return true;
 } else if (tr == 2 && tc <= rh) {
  return true;
 } else if (tr == 3 && tc >= rl && tc <= rh) {
  return true;
 } else {
  return false;
 }

}
function check_form(page) {
if ( (page == 2) && (!radio_selected(document.prontosurvey.q1)) ) {
 alert('One or more mandatory fields are empty');
 return false;
}
if ( (page == 3) && (!radio_selected(document.prontosurvey.q2)) ) {
 alert('One or more mandatory fields are empty');
 return false;
}
if ( (page == 4) && (!radio_selected(document.prontosurvey.q3)) ) {
 alert('One or more mandatory fields are empty');
 return false;
}
if ( (page == 5) && (!radio_selected(document.prontosurvey.q4)) ) {
 alert('One or more mandatory fields are empty');
 return false;
}
if ( (page == 5) && (!radio_selected(document.prontosurvey.q5)) ) {
 alert('One or more mandatory fields are empty');
 return false;
}
if ( (page == 6) && (!radio_selected(document.prontosurvey.q6)) ) {
 alert('Please choose one');
 return false;
}
if ( (page == 7) && (!radio_selected(document.prontosurvey.q7)) ) {
 alert('One or more mandatory fields are empty');
 return false;
}
if ( (page == 8) && (!radio_selected(document.prontosurvey.q8)) ) {
 alert('One or more mandatory fields are empty');
 return false;
}
if ( (page == 9) && (!radio_selected(document.prontosurvey.q9)) ) {
 alert('You need to choose a value between 1 - 10');
 return false;
}
if ( (page == 9) && (!radio_selected(document.prontosurvey.q10)) ) {
 alert('You need to choose a value between 1 - 10');
 return false;
}
if ( (page == 9) && (!radio_selected(document.prontosurvey.q11)) ) {
 alert('You need to choose a value between 1 - 10');
 return false;
}
if ( (page == 9) && (!radio_selected(document.prontosurvey.q12)) ) {
 alert('You need to choose a value between 1 - 10');
 return false;
}
if ( (page == 9) && (!radio_selected(document.prontosurvey.q13)) ) {
 alert('You need to choose a value between 1 - 10');
 return false;
}
if ( (page == 9) && (!radio_selected(document.prontosurvey.q14)) ) {
 alert('You need to choose a value between 1 - 10');
 return false;
}
if ( (page == 9) && (!radio_selected(document.prontosurvey.q15)) ) {
 alert('You need to choose a value between 1 - 10');
 return false;
}
if ( (page == 9) && (!radio_selected(document.prontosurvey.q16)) ) {
 alert('You need to choose a value between 1 - 10');
 return false;
}
if ( (page == 9) && (!radio_selected(document.prontosurvey.q17)) ) {
 alert('You need to choose a value between 1 - 10');
 return false;
}
if ( (page == 9) && (!radio_selected(document.prontosurvey.q18)) ) {
 alert('You need to choose a value between 1 - 10');
 return false;
}
if ( (page == 9) && (!radio_selected(document.prontosurvey.q19)) ) {
 alert('You need to choose a value between 1 - 10');
 return false;
}
if ( (page == 10) && (!radio_selected(document.prontosurvey.q20)) ) {
 alert('You need to choose a value between 1 - 10');
 return false;
}
if ( (page == 10) && (!radio_selected(document.prontosurvey.q21)) ) {
 alert('You need to choose a value between 1 - 10');
 return false;
}
if ( (page == 10) && (!radio_selected(document.prontosurvey.q22)) ) {
 alert('You need to choose a value between 1 - 10');
 return false;
}
if ( (page == 10) && (!radio_selected(document.prontosurvey.q23)) ) {
 alert('You need to choose a value between 1 - 10');
 return false;
}
if ( (page == 10) && (!radio_selected(document.prontosurvey.q24)) ) {
 alert('You need to choose a value between 1 - 10');
 return false;
}
if ( (page == 10) && (!radio_selected(document.prontosurvey.q25)) ) {
 alert('You need to choose a value between 1 - 10');
 return false;
}
if ( (page == 10) && (!radio_selected(document.prontosurvey.q26)) ) {
 alert('You need to choose a value between 1 - 10');
 return false;
}
if ( (page == 10) && (!radio_selected(document.prontosurvey.q27)) ) {
 alert('You need to choose a value between 1 - 10');
 return false;
}
if ( (page == 10) && (!radio_selected(document.prontosurvey.q28)) ) {
 alert('You need to choose a value between 1 - 10');
 return false;
}
if ( (page == 10) && (!radio_selected(document.prontosurvey.q29)) ) {
 alert('You need to choose a value between 1 - 10');
 return false;
}
if ( (page == 10) && (!radio_selected(document.prontosurvey.q30)) ) {
 alert('You need to choose a value between 1 - 10');
 return false;
}
if ( (page == 11) && (!radio_selected(document.prontosurvey.q31)) ) {
 alert('You need to choose a value between 1 - 10');
 return false;
}
if ( (page == 11) && (!radio_selected(document.prontosurvey.q32)) ) {
 alert('You need to choose a value between 1 - 10');
 return false;
}
if ( (page == 11) && (!radio_selected(document.prontosurvey.q33)) ) {
 alert('You need to choose a value between 1 - 10');
 return false;
}
if ( (page == 11) && (!radio_selected(document.prontosurvey.q34)) ) {
 alert('You need to choose a value between 1 - 10');
 return false;
}
if ( (page == 11) && (!radio_selected(document.prontosurvey.q35)) ) {
 alert('You need to choose a value between 1 - 10');
 return false;
}
if ( (page == 11) && (!radio_selected(document.prontosurvey.q36)) ) {
 alert('You need to choose a value between 1 - 10');
 return false;
}
if ( (page == 11) && (!radio_selected(document.prontosurvey.q37)) ) {
 alert('You need to choose a value between 1 - 10');
 return false;
}
if ( (page == 12) && (!radio_selected(document.prontosurvey.q38)) ) {
 alert('You need to choose a value between 1 - 10');
 return false;
}
if ( (page == 12) && (!radio_selected(document.prontosurvey.q39)) ) {
 alert('You need to choose a value between 1 - 10');
 return false;
}
if ( (page == 12) && (!radio_selected(document.prontosurvey.q40)) ) {
 alert('You need to choose a value between 1 - 10');
 return false;
}
if ( (page == 12) && (!radio_selected(document.prontosurvey.q41)) ) {
 alert('You need to choose a value between 1 - 10');
 return false;
}
if ( (page == 12) && (!radio_selected(document.prontosurvey.q42)) ) {
 alert('You need to choose a value between 1 - 10');
 return false;
}
if ( (page == 12) && (!radio_selected(document.prontosurvey.q43)) ) {
 alert('You need to choose a value between 1 - 10');
 return false;
}
if ( (page == 12) && (!radio_selected(document.prontosurvey.q44)) ) {
 alert('You need to choose a value between 1 - 10');
 return false;
}
if ( (page == 15) && (!radio_selected(document.prontosurvey.q74)) ) {
 alert('One or more mandatory fields are empty');
 return false;
}
if ( (page == 16) && (!radio_selected_extra(document.prontosurvey.q86, document.prontosurvey.q86_extra)) ) {
 alert('One or more mandatory fields are empty');
 return false;
}
if ( (page == 17) && (!checkbox_selected(document.prontosurvey.q88, 1, 1, 0, 0, 0)) ) {
 alert('One or more mandatory fields are empty');
 return false;
}
if ( (page == 17) && (!radio_selected(document.prontosurvey.q89)) ) {
 alert('One or more mandatory fields are empty');
 return false;
}
if ( (page == 17) && (!radio_selected(document.prontosurvey.q90)) ) {
 alert('One or more mandatory fields are empty');
 return false;
}
if ( (page == 17) && (!radio_selected(document.prontosurvey.q91)) ) {
 alert('One or more mandatory fields are empty');
 return false;
}
if ( (page == 18) && (!radio_selected(document.prontosurvey.q92)) ) {
 alert('One or more mandatory fields are empty');
 return false;
}
if ( (page == 18) && (!radio_selected(document.prontosurvey.q93)) ) {
 alert('One or more mandatory fields are empty');
 return false;
}
if ( (page == 18) && (!radio_selected(document.prontosurvey.q94)) ) {
 alert('One or more mandatory fields are empty');
 return false;
}
if ( (page == 18) && (!radio_selected(document.prontosurvey.q95)) ) {
 alert('One or more mandatory fields are empty');
 return false;
}
if ( (page == 18) && (!radio_selected(document.prontosurvey.q96)) ) {
 alert('One or more mandatory fields are empty');
 return false;
}
if ( (page == 18) && (!radio_selected(document.prontosurvey.q97)) ) {
 alert('One or more mandatory fields are empty');
 return false;
}
if ( (page == 18) && (!radio_selected(document.prontosurvey.q98)) ) {
 alert('One or more mandatory fields are empty');
 return false;
}
if ( (page == 18) && (!radio_selected(document.prontosurvey.q99)) ) {
 alert('One or more mandatory fields are empty');
 return false;
}
if ( (page == 18) && (!radio_selected(document.prontosurvey.q100)) ) {
 alert('One or more mandatory fields are empty');
 return false;
}
if ( (page == 18) && (!radio_selected(document.prontosurvey.q101)) ) {
 alert('One or more mandatory fields are empty');
 return false;
}

}