/*
  browser detection
*/

  var ie55 = false;
  var browser = navigator.appName;
  var version = navigator.appVersion;
  if (version.indexOf('MSIE') > -1) {
    var myRegExp = /MSIE ([0-9]\.[0-9])/g;
    myRegExp.exec(version);
    version = RegExp.$1;
  }
  version = parseFloat(version);
  if (browser == 'Microsoft Internet Explorer' && version >= 5.5 && version < 7.0) ie55 = true;

/* 
  method: replace logo if ie55
*/
  function onload_handler() {
    if (ie55) {
      var bgimg = document.getElementById('navigation');
      //var bgimgsrc = bgimg.style.backgroundImage.substr(5,bgimg.style.backgroundImage.length-2);
      bgimg.style.backgroundImage = 'none';
      bgimg.style.filter = "progid:DXImageTransform.Microsoft.AlphaImageLoader(enabled=true, sizingMethod=crop, src='/images/logo.png');"
    }
  }