// JavaScript Document
function getLabelForId(id) {
 var label, labels = document.getElementsByTagName('label');
 for (var i = 0; (label = labels[i]); i++) {
   if (label.htmlFor == id) {
     return label;
   }
 }
 return false;
}
function checkRequired(id) {
 var formfield = document.getElementById(id);
 var label = getLabelForId(id);
 if (formfield.value.length == 0) {
   label.className = 'problem';
 } else {
   label.className = 'completed';
 }
}// JavaScript Document