icon problems

Hello,

I made a skin with SpinkBB and I'm now editing it, and changing the normal icons to self made ones. At first when I looked through the _cs.css file of the skin and edited it, it worked. The icons where changed.
But now I made new ones, and want to change them, so I thought, I don't touch the code, but I change the image files and replace them (same name etc.) Because the code is still refering to the images.

But now It keeps showing the old replaced buttons (If that isn't clear, I replaced the default ones, and now I want to replace the ones I replaced too.)
, even if I delete the whole img file from my FTP directory, it keeps showing the old replaced buttons That's kinda weird .. So I deleted it, checked it all like 5 times, and re-uploaded it, and it still doesn't works.

Excuse me for my English,

Edit: And yes, I edited the script so I refers to the right uploaded images in my FTP directory.