Using CMS Made Simple (v1.10.3) and the Gallery Module (1.5.3) I have a problem that when images are called having clicked on a thumbnail the page title (Gallery in the screenshot) appears on top of the light box instead of behind.

The problem is with IE8 and IE9 (and I assume all IE browsers).

FireFox and Safari are fine.

Can anyone help me resolve this problem?

Looks like you are trying to use some font replacement JS, sifr, which has style sheet making the text have a higher z-index rating, actually a position absolute, than the pop up, remove it and I'm sure it will work...

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Extensions » Modules/Tags click the name of the module/tag or Help to the right to get its parameters.
Right click and view source is a great way to see what you have to work with.
Check ver. CMSMS, PHP, server OS, in System Information page.
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Thanks - you were right. Problem caused by the sIFR javascript library, needed to be modified to stop this from happening. sifr.js updated and all working.