Clean website and optimize speed

Need experienced coder/designer to fully clean a and reduce the download time of a small website using a javascript menu, a javascript slider and a jquery lightbox: * Clean, fix any error, missing file for all html, javascript, css, js files. * Remove any unnecessary code in order to reduce file sizes for all html, javascript, css, js files. * Make an error report for every page. * Reduce image sizes using compression without loosing much quality (png, jpg, gif) * Remove any unecessary files * Make javascript menu load right away and slider load after * Make flash slider if can improve speed * Make one banner from top banner, instead of several images, if this can improve speed. All pages should be able to load in less than 5 seconds with a 128kb per second modem. Suggest any improvement to achieve this target. Suggest tool to check all errors of site. Make report for all pages. Budget: 35$.