Why does the transparent shader makes the entire object seethrough?

I've used transparent shaders like this before, but this time, the entire object becomes transparent. Using a non-transparent bumped specular shader, everything is solid (not transparent). When I use the transparent shader, I have "Alpha is transparency" checked, but the entire object becomes transparent. Does anyone know why this could be? Thanks in advance! Oh and by the way (if this helps), everything that should be solid is solid and everything that should be transparent is transparent when I use the transparent/cutout/diffuse shader.