Firefox ToolbarButton bounces on mouse over

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Descriptive summary

After creating a FCKToolbarButton with a custom 16x16px image, on mouse over in Firefox 2.0.0.2 the button image bounces. Works fine in IE6/7.

Steps to reproduce

1. Code:

   // Create the "CMSContent" toolbar button.
   // FCKToolbarButton( commandName, label, tooltip, style, sourceView, contextSensitive )
   var oCMSContentItem = new FCKToolbarButton( 'CMSContent', FCKLang["CMSContentBtn"], null, null, false, true ); 
   oCMSContentItem.IconPath = FCKConfig.PluginsPath + 'CMSContent/cmscontent.gif'; 
   
   // 'CMSContent' is the name that is used in the toolbar config.
   FCKToolbarItems.RegisterItem( 'CMSContent', oCMSContentItem );
   

2. Setup the button to load on the menu bar.
3. Open FCK and mouse over the button. Bounce!

Browser name and OS

Firefox 2.0.0.2 in Windows / Linux

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With the mouse over the button

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Mouse not over the button

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Animation

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Only seems to do it on Firefox with the Office 2003 style.

Default style works great.

[fredck]

Fixed with [344].

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