Set image url

Hi.
I have one scene with multiple hotspots. When I click one of them I want to set a global variable to a specific name, say "31602".
Then I want the hotspot to load another scene (this is no problem..) but to get the image cube url from the name specified in my global variable.

Here is my code for the hotspot:

onclick="set(currentapartment, 31602); loadscene(balconyview, null, MERGE, BLEND(1)) "

Here is my code for the scene which opens up (balconyview):

<cube url="panos/(get(currentapartment)).tiles/pano_%s.jpg" />

Help appreciated !!