Image based Hotspots no loop?

setinterval(calc('crop_anim_' + name), calc(1.0 / %3),
	   	 if(loaded,
	   		 inc(frame);
	   		 if(frame GE frames, if(onlastframe !== null, onlastframe() ); set(frame,0); );
	   		 mod(xpos, frame, xframes);
	   		 div(ypos, frame, xframes);
	   		 Math.floor(ypos);
	   		 mul(xpos, %1);
	   		 mul(ypos, %2);
	   		 calc(crop, xpos + '|' + ypos + '|%1|%2');


	   	   ,
	   		 clearinterval(calc('crop_anim_' + name));
	   	   );
	      );