First i see that you are just renaming the old versions of the jscript_tpp.js file. You can't rename the file name part because any file that has the prefix jscript_ and the extension .js will still be loaded (thats how zen-cart works). So it appears the the _old version is overwriting the new version since its is listed alphabetically after the non-old one. Same with the _V5 version. You need to rename the jscript and .js parts. Something like:
jxscript_tpp.js_old, jxscript_tpp.js_v5,
That should fix your main image problem.
I don't have any PC's with IE6 to test the other problem but I think I might know what the problem is and I will take a look
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