First time-helpme <scene name="s5" onstart="delayedcall(20,action(switchscene,s5,s6,0,0))" > doesn't work

Hi! it's the first time i work with krpano, it's great but i have a problem switching from a scene to another could you help me?? this is the code in the tour.xml
<scene name="s3" onstart="delayedcall(20,action(switchscene,s3,s4,0,0))" >
and the actions
<action name="switchscene">
if(curscene == %1,
set(newh,get(view.hlookat));
set(newv,get(view.vlookat));
set(newf,get(view.fov));
inc(newh,%3);
inc(newv,%4);
inc(newf,%5);
loadscene(%2, null, MERGE,BLEND(2));
lookat(get(newh),get(newv),get(newf));
set(curscene,%2);
);
</action>
it load s4 scene but it doesn't complete loading and never shows the scene

the same code changing the names of the scenes not load anysthing
everything is stopped
could you help me?? i don't know what is the problem??thank you

thank you for the answer, i resolved with this the code more simply

<action name="switchscene">
if(curscene == %1,action(cs,%2););
</action>
thank you bye