nextgen random picture

so I just got this set up tonight, got the random widget setup on my sidebar, upload some pics, etc … back to my main page, I click on the picture and it darken my screen to show the picture and then sometimes for the same image, instead of darken my screen and show the pic, it would override my current page with the picture.

anyway or tweak I need to do so that everytime someone click on the picture, it would just darken their screen and display the picture in its original size?

hrmm… hope that made sense.

Thanks.