How can I make my web application look correct in IE 8 and 9? [closed]

I find that my application does not look as good in IE as in Chrome and Firefox. Perhaps it shows everything in wrong way. Well, I want to solve the issue I have.So I try my hand with IE developer tool but I find nothing to customize styles and CSS. So how do others do these things for IE?I mean, I don't care much how it works in 6, but how can I make it look like it does in Firefox and Chrome in IE 8 or 9?Well, what trick do you use when you need to do something in IE? Well, I know nothing in web design but I want to refactor the existing code so that it works.So, the thing is, how can I make them compatible with IE 8 or 9? Are their any tools that exist to make them work?
 
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