101504 Need picture gallery fixed

I have a gallery on my website but it needs to get fixed. I have the ability to add pictures to it from an admin panel, I can also edit the description and title of each individual picture. here is the problem I have: I have the ability to delete pictures from the gallery but adding another picture to gallery will not fill the spot of the deleted picture, so this leaves an "empty picture holder" and looks silly as you browse gallery. I want to be able to delete pictures and by placing another picture this picture will replace the one I deleted without leaving a white or empty picture holder in between pictures. If possible: I would like the thumnails to look a little better quality than what they look right now. ( a little blurry ) I want to be able to see which picture it is even though is a thumnail version of the picture. Any other ideas or features are welcome, Thanks! PM me to get link to my gallery.