/* Simplified roll-over script based on http://www.dnolan.com/code/js/rollover/. Props! */
function initRollovers() {
  if (!document.getElementById) return;
  
  var aPreLoad = new Array();
  var sTempSrc;
  var aImages = document.getElementById('navigation').getElementsByTagName('img');
  var imgSuffix = '_on';

  for (var i = 0; i < aImages.length; i++) {
    if (aImages[i].className == 'skip') {
      continue;
    }
    var src = aImages[i].getAttribute('src');
    var ftype = src.substring(src.lastIndexOf('.'), src.length);
    var hsrc = src.replace(ftype, imgSuffix+ftype);

    aImages[i].setAttribute('hsrc', hsrc);
    
    aPreLoad[i] = new Image();
    aPreLoad[i].src = hsrc;
    
    aImages[i].onmouseover = function() {
      sTempSrc = this.getAttribute('src');
      this.setAttribute('src', this.getAttribute('hsrc'));
    }	
    
    aImages[i].onmouseout = function() {
      if (!sTempSrc) sTempSrc = this.getAttribute('src').replace(imgSuffix+ftype, ftype);
      this.setAttribute('src', sTempSrc);
    }
  }
}

window.onload = initRollovers;