function testing_set() {
// radiobutton[5].checked = true;
 alert('hit key');
}

function radio_selected(radiobutton) {
 for (i = 0; i < radiobutton.length; i++) {
  if (radiobutton[i].checked) {
   return true;
  }
 }
 return false;
}
function check_apnea() {
 alert('Are you sure you have been DIAGNOSED with CENTRAL sleep apnea? This is a rare condition and different than obstructive sleep apnea. If you have not been diagnosed with central sleep apnea, change your answer to No.');
}

function check_form(page) {
 
var anum=/(^\d+$)|(^\d+\.\d+$)/



if ( (page == 1) && (!radio_selected(document.prontosurvey.q1)) ) {
 alert('Must answer Yes or No');
 return false;
}
if ( (page == 1) && (!radio_selected(document.prontosurvey.q2)) ) {
 alert('Must answer Yes or No for terms and conditions');
 return false;
}
if ( (page == 4) && (!radio_selected(document.prontosurvey.q3)) ) {
 alert('Must answer question 1');
 return false;
}
if ( (page == 4) && (!radio_selected(document.prontosurvey.q4)) ) {
 alert('Must answer question 2');
 return false;
}
if ( (page == 4) && (!radio_selected(document.prontosurvey.q5)) ) {
 alert('Must answer question 3');
 return false;
}
if ( (page == 4) && (!radio_selected(document.prontosurvey.q6)) ) {
 alert('Must answer question 4');
 return false;
}
if ( (page == 4) && (!radio_selected(document.prontosurvey.q7)) ) {
 alert('Must answer question 5');
 return false;
}
if ( (page == 4) && (!radio_selected(document.prontosurvey.q8)) ) {
 alert('Must answer question 6');
 return false;
}
if ( (page == 4) && (!radio_selected(document.prontosurvey.q9)) ) {
 alert('Must answer question 7');
 return false;
}
if ( (page == 4) && (!radio_selected(document.prontosurvey.q10)) ) {
 alert('Must answer question 8');
 return false;
}
if ( (page == 4) && (!radio_selected(document.prontosurvey.q11)) ) {
 alert('Must answer question 9');
 return false;
}
if ( (page == 4) && (!radio_selected(document.prontosurvey.q12)) ) {
 alert('Must answer question 10');
 return false;
}
if ( (page == 4) && (!radio_selected(document.prontosurvey.q13)) ) {
 alert('Must answer question 11');
 return false;
}
if ( (page == 4) && (!radio_selected(document.prontosurvey.q14)) ) {
 alert('Must answer question 12');
 return false;
}
if ( (page == 4) && (!radio_selected(document.prontosurvey.q15)) ) {
 alert('Must answer question 13');
 return false;
}
if ( (page == 4) && (!radio_selected(document.prontosurvey.q16)) ) {
 alert('Must answer question 14');
 return false;
}
if ( (page == 4) && (!radio_selected(document.prontosurvey.q17)) ) {
 alert('Must answer question 15');
 return false;
}
if ( (page == 4) && (!radio_selected(document.prontosurvey.q18)) ) {
 alert('Must answer question 16');
 return false;
}
if ( (page == 4) && (!radio_selected(document.prontosurvey.q19)) ) {
 alert('Must answer question 17');
 return false;
}
if ( (page == 4) && (!radio_selected(document.prontosurvey.q20)) ) {
 alert('Must answer question 18');
 return false;
}
if ( (page == 4) && (!radio_selected(document.prontosurvey.q21)) ) {
 alert('Must answer question 19');
 return false;
}
if ( (page == 4) && (!radio_selected(document.prontosurvey.q22)) ) {
 alert('Must answer question 20');
 return false;
}

if  (page == 4) { 
 if (!anum.test(document.prontosurvey.q23.value)) {
  alert('Please enter a valid age for question 21');
  return false;
 }
 }
 if ((document.prontosurvey.q23.value < 18))  {
 alert('In question 21, age must be 18 or over');
 return false;
}
if ( (page == 5) && (!radio_selected(document.prontosurvey.q22)) ) {
 alert('Must select payment');
 return false;
}

}