Site not displaying correctly in IE

Can somebody explain me why my site is not displaying correctly in internet explorer:

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The choice of Doctype (Transitional with no URL) triggers Quirks mode, which causes browsers to emulate bugs that appeared in earlier browsers in order to cope with legacy code.

IE emulates a lot of features of IE 5.5, which was very very broken.

Use a Doctype that triggers Standards (AKA Strict) mode.

That might not solve all the problems, but it should be the first step in trying to resolve them.