Header image url link

only started building my own theme today

Have big header image of 1280px by 140px

have the image in the header region and positioned but the whole image is appearing as a link and is interfering with my nav menu

is there anyway to make only some on the image clickable preferably just the logo and not the tail end design

It would make life a whole lot easier to manage and i would be able to continue on with the theme as i only have another few days to get it up and live

its a complete mess over there as i just started today and i am trying to complete the headerthe way i want however the site is http://a-live.ie/