Change header and button graphics on Wordpress website, PSD supplied

This is the website: [login to view URL] This Wordpress with a theme called 'classipress' I have a PSD (attached) which contains the new design for header and buttons. Please see the guide ([login to view URL]) attached showing the elements that need updating with the new graphics. graphics to swap: 1) Header backkground 2) menu background 3) silver graphic behind search box 4) new 'post ad' button (please make sure it links to post new ad as before 5) button graphics to replace Please make sure the website still displays correctly in responsive view.