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Hello, Admittedly, I am new to php but not writing html code or css. I am a high school Mathematics teacher but was a techie/codemonkey in a previous job-life. I have a class website that I provide for my students and it has become too difficult to maintain in static html. So, I bought your book to make the switch to dynamic websites using Php and MySql. I followed along, stripped the headers and footers first, put everything else in a .php file and called the header and footer with includes. Worked beautifully after I beat the CSS into submission. Here is my problem: Every page in my website renders correctly using php with the included files, css3 and html5 in IE9, Firefox 4 and above, Safari and Chrome. The orginal html page renders correctly in IE7, IE8, and IE9 and the others. Original html page in IE9 on left, IE7 on right A real PHP page from my website in IE9 on left, the same PHP page in IE7 on right Any help you can give me will be most appreciated. I have several of your books and I have been reading here for a little while but I can't find a solution to my issue. Please feel free to visit the site and recreate what I have posted. http://www.zachsmath.com (BTW, the home page script works perfectly in all of the browsers using the same css files.) I am beyond frustrated. Thanks in advance for any tips or clues you can provide on how I can fix this. ZachsMath