MovieClipLoader(Help me please!!!!!!)

Hello guys
Iam using the MovieClipLoader object to load multiple jpg images by getting their names from a xml file but agfter a minute or two images are disappearing.In other words I can still get a hand cursor by rolling over them but I cant see them,please guys help me with this problem.here is my code:
var mcloader:MovieClipLoader=new MovieClipLoader();
for (i=0;i<10;i++)
{_root.attachMovie("Movie","Movie"+i,i);

_root["Movie"+i].createEmptyMovieClip("Clp"+i,10*i);



mcloader.loadClip("Folder/"+xml_var+".jpg" , _root["Movie"+i] ["Clp"+i]);
}