Conditional comments are used to write special instructions that only work in Internet Explorer below version 5.
Here are the examples how to place the elements in the middle of the parent element. One of them is improved to make it workable even in IE7 and IE6.
Proper use of CSS float property may turn out a daunting task even for an experienced coder. This article contains the examples of applying of property float, as well as some mistakes with illustrative examples.