Are you using Quickr Pickr? That is what I use.
www.quickpickr.com
Open Quickr Pickr
Enter your Flickr name
Select number (like 20, 50, 100, 200 - it is mulitple choice)
Enter tag (be sure all the photos have the tag before you start)
Then click on button to pull up photos.
It will show a thumbnail of the photos. Select all or select just the ones you want to use with a little check mark.
Select size - I use large
Click button to pull photos.
It will show you a all of the photos you selected in the correct size.
Right click on photo. This will cause a box to pop up with information about the photo.
Highlight & copy URL. Once highlighted, you can Control C to copy. (and Control V to paste)
Go to Skyscraperpage and enter this way:
[IMG]
paste url here[/IMG]
Note that IMG is in all caps and is bracketed by the boxy brackets. And the last one has a backward slash before the IMG.
Repeat for each photo. I recommend to do a couple to be sure it is working right and then going back to do the rest. Just to save yourself aggravation!