Hi Joomla world. i have installed simple image gallery. i want the pop up feature as you drag your mouse across the thumbnails. i have set up the 'myphotos' folder and have the text in the article.. but this keep popping up on my webpage

Warning: opendir(/home/blu91t/public_html/thefitzgeraldbrothers.com/images/stories/images/stories/Fitzy_Bros/myphotos) [function.opendir]: failed to open dir: No such file or directory in /home/blu91t/public_html/thefitzgeraldbrothers.com/plugins/content/jwsig.php on line 100

i have checked my cpanel and the directiory looks fine...but it says the file doesnt exist.
i'm on joomla ver 1.5 , what plugin should i be using ??