// overlabels.js
// mods by David Simmer
// simmerdesigns.com
// last modified 12.1.07


// these three functions courtesy of Particletree
String.prototype.trim = function() {
    return this.replace( /^\s+|\s+$/, "" );
}

function addClassName (elem, className) {
    removeClassName (elem, className);
    elem.className = (elem.className + " " + className).trim();
}

function removeClassName (elem, className) {
    elem.className = elem.className.replace(className, "").trim();
}


// henceforth originally sourced from ALA article

 function initOverLabels () {
  if (!document.getElementById) return;  	

  var labels, id, field;

  // Set focus and blur handlers to hide and show 
  // LABELs with 'overlabel' class names.
  labels = document.getElementsByTagName('label');
  for (var i = 0; i < labels.length; i++) {
	
// Apply to all labels for the time being
//    if (labels[i].className == 'overlabel') {

      // Skip labels that do not have a named association
      // with another field.
      id = labels[i].htmlFor || labels[i].getAttribute('for');
      if (!id || !(field = document.getElementById(id))) {
        continue;
      }

      // Change the applied class to hover the label 
      // over the form field.
      addClassName(labels[i], 'applied');
//      labels[i].className = 'overlabel-apply';

      // Hide any fields having an initial value.
      if (field.value !== '') {
	      addClassName(labels[i], 'filled');
//        hideLabel(field.getAttribute('id'), true);
      }

      // Set handlers to show and hide labels.
      field.onfocus = function () {
//         addClassName(this.getAttribute('id'), 'filled');   
        hideLabel(this.getAttribute('id'), true);
      };
      field.onblur = function () {
        if (this.value === '') {
//         removeClassName (this.getAttribute('id'), 'filled');     
        hideLabel(this.getAttribute('id'), false);
        }
      };

      // Handle clicks to LABEL elements (for Safari).
      labels[i].onclick = function () {
        var id, field;
        id = this.getAttribute('for');
        if (id && (field = document.getElementById(id))) {
          field.focus();
        }
      };

//    }
  }
};

function hideLabel (field_id, hide) {
  var field_for;
  var labels = document.getElementsByTagName('label');
  for (var i = 0; i < labels.length; i++) {
    field_for = labels[i].htmlFor || labels[i].getAttribute('for');
    if (field_for == field_id) {
//      labels[i].style.textIndent = (hide) ? '-1000px' : '0px';
      labels[i].className = (hide) ? 'applied filled' : 'applied';
      return true;
    }
  }
}

window.onload = function () {
  setTimeout(initOverLabels, 50);
};