var alertstringnumadultsninos='How many people?';
var alertstringdate='Please select your date';
var alertstringschedule='Please select your schedule';

function validateform(thisform) {	
  
  if (thisform.touradults==null && thisform.tourchild==null) {
   alert(alertstringnumadultsninos);
   return false;
  }
   if (thisform.touradults.value=='' && thisform.tourchild.value=='') {
   alert(alertstringnumadultsninos);
   return false;
  }
  if (thisform.touradults.value=='0' && thisform.tourchild.value=='0') {
   alert(alertstringnumadultsninos);
   return false;
  }
    if (thisform.touradults.value==0 && thisform.tourchild.value==0) {
   alert(alertstringnumadultsninos);
   return false;
  }
  if (thisform.tourdate==null || thisform.tourdate.value=='') {
   alert(alertstringdate);
   return false;
  }
  if (thisform.toursched==null || thisform.toursched.value=='') {
   alert(alertstringschedule);
   return false;
  }	
  return true;
}