background image help wanted

my site i am building is http://www.sportingjobs.net/ using delegate by woothemes.

i am looking to increase the height of the dark blue slider bottom line so that it then includes the other pages below it.

can someone point me in the right direction please.

have edited and increased the height of http://www.sportingjobs.net/wp-content/themes/delegate/styles/default/featurednavtile.jpg and uploaded the new jpg but it still isnt working..

do i need to adjust the height of the box somewhere else?

thanks