function validateForm(f) {
var first_field = null;
var result = true;
try {
var ar = $$('.required_field');
ar.each(function (ifield) {
if('' == ifield.value) { // need more strict empty value verification
 first_field = ifield;
result = false;
//$(ifield).setStyle({borderColor: '#CC3333'}); // red border for element
$(ifield).addClassName('required_field_highlighted');
 } else { // reset to default style of border?
//$(ifield).setStyle({borderColor: ''});
$(ifield).removeClassName('required_field_highlighted');
}
});
if (first_field) first_field.focus();
} catch (e) {}
return result;
}