New JQuery 1.5 breaks good old image lightbox... why?

Currently a (bought) JavaScript lightbox code works on my website that does work perfectly, only on older jQuery libraries like 1.3.2 and 1.4.3, but not on newer builds like 1.5

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The problem on the new jQuery libraries is, that upon clicking a thumbnail the screen first goes into the dark mode but the lightbox never shows up, somewhere during that process it stops. This happens only if I load the new jQuery libraries, which I do prefer to use since all rest of my site works faster it seems with the newer builds.

Any hints Where I should be looking for / where to find Jquery differences?

Your ideas are much appreciated.

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Line 73 - "SWFObject is not defined"

Edit: http://blog.jquery.com/2010/11/11/jquery-1-4-4-release-notes/

BACKWARDS-INCOMPATIBLE CHANGES IN JQUERY 1.4.4 The .width() and .height() methods no longer return 0 when inspecting an element hidden using ‘display: none’. To determine if an element is hidden, always use .is(‘:hidden’).

Your script is full of height() == 0 or width() == 0 or Maths calculations with width() or height(). My best recommendation is to stick with jQuery 1.4.3 or rewrite the plugin \o/