Sitemap problem [1 Attachment]

Hello Group,

i got a problem with the "sitemap" in ZMS management modus with projects that was imported from older version of zms (example: 2.12 or an older build from 2.13). In these projects it is only possible to "open" the first layer. If the navigation is deeper than 1 level so it is not possible to open these levels with the small arrowicon in the sitemap. 
I found out that in the javascript function "clickElement" the script cannot find the "title" value (+ or -) from the arrowicon. U can see the error when u insert alert(img.attr("title")); in the function after the var declarations. The script returns a "undefined" instead of "+" or "-".
The Sitemap-HTML-Code from this projekt an from a working new projekt is equal. So were is the error? Perhaps the jQuery? 

i hope someone can help me with this problem.

Best regards,
Boris Kaminski