function validateForm(form) { 
var i,field,theCheck,name,errors='';

for (i=0; i<(form.elements.length-1); i+=1) {
  field = form.elements[i];
  if (field.title) {
    theCheck=field.title.substr(field.title.length-1,1);
    if (theCheck=='*') {
      if (!(field.value) || (field.value=="@")) { //IF EMPTY FIELD
        name=field.title.substr(0,field.title.length-1);
        errors += name+' \tchybí\n';
      }
    }
  }
}
if (errors)
  alert('Objevily se následující chyby:\n'+errors);
  return (errors == '');
}