<CENTER> </CENTER>

The CENTER tag is used to center text or images. The CENTER tag is not text-level markup, so it should not be used to center single lines of text inside a paragraph or another block element. In this situation it will introduce a new paragraph. Older versions of Netscape treated CENTER as if it were text-level markup, so it was rendered without a paragraph break in these situations. For better compatibility with browsers which do not support this tag, use the ALIGN=CENTER tag on headers and paragraphs if it is possible. This tag:

<center>This text is centered.</center>

Makes this:

You can also center images, or anything else, simply use the same code as you would to center text.