function snd02() {
   var err=0;
   num = document.form01.length;
   for(j=0; j<num; j++) {
     switch(j) {
       case 21: if(document.form01.elements[j-1].checked && "" == document.form01.elements[j].value) err = 1; break;
       case 27: if(document.form01.elements[j-1].checked && "" == document.form01.elements[j].value) err = 1; break;
       case 31: if(document.form01.purchased[0].checked && "" == document.form01.elements[j].value) err = 1; break;
       case 34: break;
       case 35: break;
       default: if("" == document.form01.elements[j].value) err = 1;
     }
   }
   if(err == 1) {
     document.form01.action = "registration_error.php";
   } else {
       document.form01.action = "email.php";
     }
   document.form01.submit();
 }

 function rst() {
   document.form01.reset();
 }