Problem "add new property" - by: Joachim Schnellboegl

Hi Dam
I am nearly desperated. Since two days I tried to find the error attached. If I want to add a new property as an agent a java script error appears.
Attached (add_property_error.jpg) you will see what happened in the firebug view.
I get the following errors:
ReferenceError: jQuery is not defined textext.core.js (Zeile 1583, Spalte 1)
})(jQuery);

ReferenceError: jQuery is not defined textext...tags.js (Zeile 698, Spalte 1)
})(jQuery);

ReferenceError: jQuery is not defined mein-profil-bearbeiten (Zeile 764, Spalte 10)
<i class="osicon-ok"></i>
It would be very, very nice, if you have a proposal for a solution.
Thank you in advance for your help.
Joachim