No worries.
It looks like it is a set of images.
"+++++++++++++/niceblue/borda1.gif"
"+++++++++++++/niceblue/tbg.gif"
"+++++++++++++/niceblue/borda2.gif"
They should be in your header. If you edit them to make them smaller it would do what you want. Right now they are (x) x 49px --change the 49 to something smaller on all 3.
You can close that test site up now so you don't get in trouble