Joomla 2.5 with ajax module working on the site

I want someone to fix some code work on a Joomla 2.5 site which as the ajax module loading the articles. I need the home page fixed. When you go from the home page to articles then back to home page again, it loads the page with white background behind images. I need this fixed so no background. Also their is slight white line to the right of the images to be taken out. Also the loading speed of the pages, sometimes it takes a while to load the page when you go from one article to another. Also when you leave the screen for a while like a hour and come back to click on pages it will not reload, you have to refresh the whole page