Ok took a look at it. It seems that you have actionscript on a MovieClip instance of "randomjpeg" with an instance name of "location" and you have about the same code on frame 51 of the randomjpeg layer.

Any time you put code directly onto a MovieClip, you have to have the code within an on handler like onClipEvent(load){}; but i'm guessing you replaced the code with the code on the frame, if that's the case just delete the extra code.

here is the code from the MovieClip:

Code:
choice = Math.round(Math.random()*6);
switch (choice) {
case 0 :
	location.loadMovie("image0.swf");
	break;
case 1 :
	location.loadMovie("image1.swf");
	break;
case 2 :
	location.loadMovie("image2.swf");
	break;
case 3 :
	location.loadMovie("image3.swf");
	break;
case 4 :
	location.loadMovie("image4.swf");
	break;
case 5 :
	location.loadMovie("image5.swf");
	break;
case 6 :
	location.loadMovie("image6.swf");
	break;
}
Nearly identical but with case 6. Hope that explanation makes sense.