Please use this metatag needs to be first in the <head> (before any css):
Code:
<meta http-equiv="X-UA-Compatible" content="IE=7" />
This tag displays the site as same as in IE7 but in IE 8.I tried this code in my project the site was working fine as same as in IE 7 browsers.So we no need to worry about writing separate code for IE8.
This is a small trick for browser compatibility 
Please try this one. 