var thisURL = "http://www.volkswagen.com.au/vwcms_publish/etc/medialib/vwcms/virtualmaster/en_au/common/flexible_iframe.Par.0001.File.html";


function checkHeightandLoadiFrame() {
  var winHeight = document.body.scrollHeight;
  var userAgent = navigator.userAgent.toLowerCase();
  if ((userAgent.indexOf("firefox/") != -1)) {
    var browserVers = userAgent.split("firefox/");
    browserVers = parseFloat(browserVers[1].slice(0,3));
    if (browserVers >= "1.5") {
      winHeight = document.body.offsetHeight;
    }
  }
	document.getElementById('vwiFrame').src = thisURL + "?height=" +winHeight;
}