var useSvg=true;

function switchExType(elt)
{
  useSvg=!useSvg;
  chooseExType();
}  

function chooseExType()
{
  if (!useSvg)
  {
    useSvg = false;
  }
  if (useSvg)
    {
    for (i in document.embeds)
    {
      if (document.embeds[i].className=="svgex")
      {
        document.embeds[i].style.display = "inline";
      }
    }
    for (i in document.images)
    {
      if (document.images[i].className=="rasex")
      {
        document.images[i].style.display = "none";
      }
    }
  }
  else
  {
      for (i in document.embeds)
      {
        if (document.embeds[i].className=="svgex")
        {
          document.embeds[i].style.display = "none";
        }
      }
      for (i in document.images)
      {
        if (document.images[i].className=="rasex")
        {
          document.images[i].style.display = "inline";
        }
      }
  }
  if (typeof document.getElementById != "undefined") 
    exSwitchObj = document.getElementById("exSwitch");
  else
    exSwitchObj = document.all["exSwitch"];
  exSwitchObj.innerHTML= (useSvg ? "Turn SVG Off" : "Turn SVG On");
}