Header graphic not displaying all way across

Hello,

I am very new to WordPress and am having trouble getting my header to display all the way across.

The theme I am using is fantastic and likely I am missing something. It makes things easy and I have carefully put the px size into form fields etc. These sizes show up in the CSS, so there is no problem with transposition. (I do not know anything about CSS but follow logic flows.)

I have tried various custom image logo positions without success (there is a form field for them which makes things easier for ignorant people like me).

Get The Image plug in is installed, though as this issue relates to my header and not a post presumably it is not related to that.

The site is:

http://www.PersonalDevelopmentMagic.net

The image URL, which has been inserted into another special form field is:

http://personaldevelopmentmagic.net/wp-content/uploads/2008/09/personal_development_magic_key.jpg

Does anyone have an ideas please?

PS: Site is hosted on Go Daddy and I have been unable to find out how to do any CHModding – they seem to have a series of tick boxes.

Thanks in advance.

Alex