How to delete photos from iPhoto in iPhone 4S?

So when I got my iphone, I thought it would be a good idea to import all my iphoto photos (all 2500 of them) onto my phone.
However, I want to get the new software update, and it won't let me because I don't have enough storage. I have tried almost EVERYTHING to get these darn photos to be deleted, but I can't figure out how to do it.
When I go on itunes, the only thing that comes up under the photos section is just "sync". That's it.

I tried to delete them manually on my phone, but I don't have that "delete" option. (when you open an album, click on the right, and a delete button should come up at the bottom).

When you connect the ihone to the computer, just access it like if it was a hard drive, ( not with itune) and you will probable be able to see those pictures and delete them. OR with itune, just sync the photos folder with an empty folder ( choose which folder to sync to, before syncing)

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