Internet Explorer Compatibility View
In general, Internet Explorer works fine with all web pages. However, in some cases, the pages aren't rendered correctly. This is generally due to the fact that the people creating the page made minor mistakes that IE7ignores but which IE8 or IE9 -- which require more precision -- does not. There is an easy way to display a web page properly if it's not compatible with MSIE8 or MSIE9: compatibility view.
Essentially, compatibility view switches the browser to MSIE7, thus allowing the errors without displaying them. Switch to it, and problems can be fixed.
To switch to it, click on the compatibility view button on the address bar;
To switch back to MSIE8 or MSIE9 rendering, click on the button again.