I developed some javascript enhanced pages that run fine on recent Firefox and Safari. I missed to check in Internet Explorer, and now I find the pages don't work on IE 6 and 7 (so far). The scripts are somehow not executed, the pages show as if javascript wasn't there, although some javascript is executed. I am using own libraries with dom manipulation, from YUI 2 I use YUI-Loader and the XML-Http-Request, and on one page I use "psupload", which depends on JQuery.

I am installing Microsoft Script Editor from Office XP and will now debug. I will also write specific tests now.

What are the typical failing points of IE? What direction I can keep my eyes open.

I found this page, which shows some differences: http://www.quirksmode.org/compatibility.html

Can you from your experience name some typical things I should look for first?

I will also ask more questions here for specific tasks later, but for now I am interested in your experience why IE usually fails on scripts that run fine in Firefox