is it possible onload current xml and load new one ?

hi everyone
I am totally new with krpano , and also javascript
I have experiment project that is an apartment with three floors I've made krpano for each floor separately
Each one works good and there is no problem ... But I want to access other Floors from the main floor
Is there any fast way to do without changing all source code ?
just unload current .xml & load another one inside .added two screenshots for better understanding
thanks so much...