Wordpress design stuff

Hi,

I have taken a Wordpress template and adapted it. You can see it here
at http://ticklebooth.com/

The one problem I am having is that I want the Banner/masthead to keep
its transparency and fall on the purple and grey background.
Unfortunately, to maintain the tranparency I have to turn off the rap
background because it starts where the banner starts. Instead of a
color I used a picture for the rap background with the top of the
picture showing transparency. However, as the picture has be repeated,
it repeats those (transparent) holes in the body. How can I solve this
problem?

I have little exprience with HTML or anything like that. I appreciate
all your answers.

Ajit