When you have clicked upload and it says waiting for server response what is actually happening is your photos are still loading and once they are complete auctiva sends a signal lettng you know they are actually done.
I am on cable and depending on the size of my photos and how many it can take quite some time to upload for me.
I choose to only upload a few photos at a time for this reason.
Since your on dial up if your photos are of good quality in size and pixel count it can take you an eternity to upoload them.
Some image hoasting servers will not allow dial up to load high quality images tying up their bandwidth for too long with slow dial up.
I know ebay will not allow this but do not know about auctiva.
What will happen is the program will sometimes seem to freeze because the server is rejecting the upload due to the low dial up and large images.
Try uploading only two photos at something like 10X15 photos at 50 dpi.
You will need to use a photo program such as corel photo or adobe photoshop.