[TYPO3-core] RFC #12923: Javascript error in tmenu_layers.php & gmenu_layers.php

[Benjamin Mack]

Hey all,

this is a SVN patch request.

Branches: trunk, 4.3, 4.2

BT reference: http://bugs.typo3.org/view.php?id=12923

Severity: low

Problem:
ie alerts a javascript error sometimes, whe the mouse is moved during 
pageload. there is a small timespan when the mousemovehandler is already 
registered but the script not loaded.

Solution:
a try/catch construt fixes this:patch for tmenu_layers below, 
gmenu_layers is simmilar

Notes:
The solution and the patch is by Klaus Gössl, I cleaned it up and 
attached a revised version here in the BT, which includes my +1 by 
testing and reading. I found this issue as I had the same problem in one 
installation.

All the best,
Benni.
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