I'm using prophoto 3.  yes, the wp-simpleviwer plug in.

I'm using prophoto theme v3

this is what it says when I try to use simpleviewer:

[simpleviewer
Warning: domdocument() expects at least 1 parameter, 0 given in /home/content/n/a/t/natmyers/html/blog/wp-content/plugins/wp-simpleviewer/build-gallery.php on line 100

Fatal error: Call to undefined method: domdocument->load() in /home/content/n/a/t/natmyers/html/blog/wp-content/plugins/wp-simpleviewer/build-gallery.php on line 101
]