It appears that no matter what we use for a tag in GetHtmlTag, it is ignored.
I have tried "Auto", "Png", "JPeg", "Image". No matter what I use, I always get a png for Firefox and an object for IE.
IE always returns results similar to: <script src="/ChartFXInt62/Temp/CFT0324_03193734A1A.js"></script><script>cfx_replaceChart1();</script>
For some reason, the object is not rendering for IE so we just want to return a Png or Jpeg, but not luck.