// Rollover  v2.0.1
// documentation: http://www.dithered.com/javascript/rollover/index.html
// license: http://creativecommons.org/licenses/by/1.0/
// code by Chris Nott (chris[at]dithered[dot]com)


function isDefined(property) {
  return (typeof property != 'undefined');
}

var rolloverInitialized = false;
function rolloverInit() {
   if (!rolloverInitialized && isDefined(document.images)) {
      
var images = new Array();

var imagenes_collection = document.getElementsByTagName('img');
var inputs_collection = document.getElementsByTagName('input');

for (var i = 0; i < imagenes_collection.length; i++) {
    images.push(imagenes_collection[i]);
}

for (var i = 0; i < inputs_collection.length; i++) {
    if (inputs_collection[i].type == 'image') {
      images.push(inputs_collection[i]);
    }
}

      
      // get all images with '_off.' in src value
      for (var i = 0; i < images.length; i++) {
         if (images[i].src.indexOf('-out.') != -1) {
            var image = images[i];
            
            // store the off state filename in a property of the image object
            image.offImage = new Image();
            image.offImage.src = image.src;
            
            // store the on state filename in a property of the image object
            // (also preloads the on state image)
            image.onImage = new Image();
            image.onImage.imageElement = image;
            
            // add onmouseover and onmouseout event handlers once the on state image has loaded
            // Safari's onload is screwed up for off-screen images; temporary fix
            if (navigator.userAgent.toLowerCase().indexOf('safari') != - 1) {
               image.onmouseover = function() {
                  this.src = this.onImage.src;
               };
               image.onmouseout = function() {
                  this.src = this.offImage.src;
               };
            }
            else {
               image.onImage.onload = function() {
                  this.imageElement.onmouseover = function() {
                     this.src = this.onImage.src;
                  };
                  this.imageElement.onmouseout = function() {
                     this.src = this.offImage.src;
                  };
               };
            }
            
            // set src of on state image after defining onload event handler
            // so cached images (that load instantly in IE) will trigger onload
            image.onImage.src = image.src.replace(/-out\./, '-over.');
         }
      }
   }
   rolloverInitialized = true;
}

// call rolloverInit when document finishes loading
if (isDefined(window.addEventListener)) {
   window.addEventListener('load', rolloverInit, false);
}
else if (isDefined(window.attachEvent)) {
   window.attachEvent('onload', rolloverInit);
}