function radio_selected(radiobutton) {
 for (i = 0; i < radiobutton.length; i++) {
  if (radiobutton[i].checked) {
   return true;
  }
 }
 return false;
}
function check_form(page) {
if ( (page == 1) && (!radio_selected(document.prontosurvey.q1)) ) {
 alert('Please answer every question to proceed.');
 return false;
}
if ( (page == 1) && (!radio_selected(document.prontosurvey.q2)) ) {
 alert('Please answer every question to proceed.');
 return false;
}
if ( (page == 1) && (!radio_selected(document.prontosurvey.q3)) ) {
 alert('Please answer every question to proceed.');
 return false;
}
if ( (page == 1) && (!radio_selected(document.prontosurvey.q4)) ) {
 alert('Please answer every question to proceed.');
 return false;
}
if ( (page == 1) && (!radio_selected(document.prontosurvey.q5)) ) {
 alert('Please answer every question to proceed.');
 return false;
}
if ( (page == 1) && (!radio_selected(document.prontosurvey.q6)) ) {
 alert('Please answer every question to proceed.');
 return false;
}
if ( (page == 2) && (!radio_selected(document.prontosurvey.q7)) ) {
 alert('Please answer every question to proceed.');
 return false;
}
if ( (page == 2) && (!radio_selected(document.prontosurvey.q8)) ) {
 alert('Please answer every question to proceed.');
 return false;
}
if ( (page == 2) && (!radio_selected(document.prontosurvey.q9)) ) {
 alert('Please answer every question to proceed.');
 return false;
}
if ( (page == 2) && (!radio_selected(document.prontosurvey.q10)) ) {
 alert('Please answer every question to proceed.');
 return false;
}
if ( (page == 2) && (!radio_selected(document.prontosurvey.q11)) ) {
 alert('Please answer every question to proceed.');
 return false;
}
if ( (page == 2) && (!radio_selected(document.prontosurvey.q12)) ) {
 alert('Please answer every question to proceed.');
 return false;
}
if ( (page == 2) && (!radio_selected(document.prontosurvey.q13)) ) {
 alert('Please answer every question to proceed.');
 return false;
}
if ( (page == 2) && (!radio_selected(document.prontosurvey.q14)) ) {
 alert('Please answer every question to proceed.');
 return false;
}
if ( (page == 2) && (!radio_selected(document.prontosurvey.q15)) ) {
 alert('Please answer every question to proceed.');
 return false;
}
if ( (page == 2) && (!radio_selected(document.prontosurvey.q16)) ) {
 alert('Please answer every question to proceed.');
 return false;
}
if ( (page == 2) && (!radio_selected(document.prontosurvey.q17)) ) {
 alert('Please answer every question to proceed.');
 return false;
}
if ( (page == 3) && (!radio_selected(document.prontosurvey.q18)) ) {
 alert('Please answer every question to proceed.');
 return false;
}
if ( (page == 3) && (!radio_selected(document.prontosurvey.q19)) ) {
 alert('Please answer every question to proceed.');
 return false;
}
if ( (page == 3) && (!radio_selected(document.prontosurvey.q20)) ) {
 alert('Please answer every question to proceed.');
 return false;
}
if ( (page == 3) && (!radio_selected(document.prontosurvey.q21)) ) {
 alert('Please answer every question to proceed.');
 return false;
}
if ( (page == 3) && (!radio_selected(document.prontosurvey.q22)) ) {
 alert('Please answer every question to proceed.');
 return false;
}
if ( (page == 3) && (!radio_selected(document.prontosurvey.q23)) ) {
 alert('Please answer every question to proceed.');
 return false;
}
if ( (page == 3) && (!radio_selected(document.prontosurvey.q24)) ) {
 alert('Please answer every question to proceed.');
 return false;
}
if ( (page == 3) && (!radio_selected(document.prontosurvey.q25)) ) {
 alert('Please answer every question to proceed.');
 return false;
}
if ( (page == 3) && (!radio_selected(document.prontosurvey.q26)) ) {
 alert('Please answer every question to proceed.');
 return false;
}
if ( (page == 3) && (!radio_selected(document.prontosurvey.q27)) ) {
 alert('Please answer every question to proceed.');
 return false;
}
if ( (page == 3) && (!radio_selected(document.prontosurvey.q28)) ) {
 alert('Please answer every question to proceed.');
 return false;
}
if ( (page == 3) && (!radio_selected(document.prontosurvey.q29)) ) {
 alert('Please answer every question to proceed.');
 return false;
}
if ( (page == 4) && (!radio_selected(document.prontosurvey.q30)) ) {
 alert('One or more mandatory fields are empty');
 return false;
}
if ( (page == 5) && (!radio_selected(document.prontosurvey.q31)) ) {
 alert('Please answer every question to proceed.');
 return false;
}
if ( (page == 5) && (!radio_selected(document.prontosurvey.q32)) ) {
 alert('Please answer every question to proceed.');
 return false;
}
if ( (page == 5) && (!radio_selected(document.prontosurvey.q33)) ) {
 alert('Please answer every question to proceed.');
 return false;
}
if ( (page == 5) && (!radio_selected(document.prontosurvey.q34)) ) {
 alert('Please answer every question to proceed.');
 return false;
}
if ( (page == 5) && (!radio_selected(document.prontosurvey.q35)) ) {
 alert('Please answer every question to proceed.');
 return false;
}
if ( (page == 5) && (!radio_selected(document.prontosurvey.q36)) ) {
 alert('Please answer every question to proceed.');
 return false;
}
if ( (page == 5) && (!radio_selected(document.prontosurvey.q37)) ) {
 alert('Please answer every question to proceed.');
 return false;
}
if ( (page == 5) && (!radio_selected(document.prontosurvey.q38)) ) {
 alert('Please answer every question to proceed.');
 return false;
}
if ( (page == 5) && (!radio_selected(document.prontosurvey.q39)) ) {
 alert('Please answer every question to proceed.');
 return false;
}
if ( (page == 5) && (!radio_selected(document.prontosurvey.q40)) ) {
 alert('Please answer every question to proceed.');
 return false;
}
if ( (page == 5) && (!radio_selected(document.prontosurvey.q41)) ) {
 alert('Please answer every question to proceed.');
 return false;
}
if ( (page == 5) && (!radio_selected(document.prontosurvey.q42)) ) {
 alert('Please answer every question to proceed.');
 return false;
}
if ( (page == 5) && (!radio_selected(document.prontosurvey.q43)) ) {
 alert('Please answer every question to proceed.');
 return false;
}
if ( (page == 6) && (!radio_selected(document.prontosurvey.q44)) ) {
 alert('Please answer every question to proceed.');
 return false;
}
if ( (page == 6) && (!radio_selected(document.prontosurvey.q45)) ) {
 alert('Please answer every question to proceed.');
 return false;
}
if ( (page == 6) && (!radio_selected(document.prontosurvey.q46)) ) {
 alert('Please answer every question to proceed.');
 return false;
}
if ( (page == 6) && (!radio_selected(document.prontosurvey.q47)) ) {
 alert('Please answer every question to proceed.');
 return false;
}
if ( (page == 6) && (!radio_selected(document.prontosurvey.q48)) ) {
 alert('Please answer every question to proceed.');
 return false;
}
if ( (page == 6) && (!radio_selected(document.prontosurvey.q49)) ) {
 alert('Please answer every question to proceed.');
 return false;
}
if ( (page == 6) && (!radio_selected(document.prontosurvey.q50)) ) {
 alert('Please answer every question to proceed.');
 return false;
}
if ( (page == 6) && (!radio_selected(document.prontosurvey.q51)) ) {
 alert('Please answer every question to proceed.');
 return false;
}
if ( (page == 6) && (!radio_selected(document.prontosurvey.q52)) ) {
 alert('Please answer every question to proceed.');
 return false;
}
if ( (page == 6) && (!radio_selected(document.prontosurvey.q53)) ) {
 alert('Please answer every question to proceed.');
 return false;
}
if ( (page == 6) && (!radio_selected(document.prontosurvey.q54)) ) {
 alert('Please answer every question to proceed.');
 return false;
}
if ( (page == 6) && (!radio_selected(document.prontosurvey.q55)) ) {
 alert('Please answer every question to proceed.');
 return false;
}
if ( (page == 7) && (!document.prontosurvey.q56.value) ) {
 alert('Please tell us your name.');
 return false;
}
if ( (page == 7) && (!document.prontosurvey.q58.value) ) {
 alert('We cannot send you our analysis without an email address.');
 return false;
}

}