> May it depend from Mozilla version?

I expect so.  I'm running 1.7/1.8a.
The errors I get in the page are:

Error: uncaught exception: Permission denied to get property Window.status

Error: bookmarkButton is not defined
Source File: http://sru.metavista.it/zgw/catalogen.html
Line: 808

Error: showCategories is not defined
Source File: http://sru.metavista.it/zgw/catalogen.html
Line: 820

Error: showArchives is not defined
Source File: http://sru.metavista.it/zgw/catalogen.html
Line: 824


Hope that helps,

Rob


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