Photo Gallery using XML and Flash

Hi,

I tried this tutorial [color=#0066cc][size=2][color=#003366]Photo Gallery using XML and Flash[/color][/size][font=Verdana][size=1][color=#0066cc] [/color][/size][/font][/color]in this web site for which I loaded 27 images .but to my surprise image no.11,12,13 and 19 are not coming while other images are showing perfectly. what could be the reason for not loading the images? I changed the sequence of the images but still its not working.
I just want to know what are the reasons due to which an image may fail to load to swf.
Thanks,
kedar