for simple html use:
<BODY background="image_filename.jpg">
where image_filename.jpg is the name of the repeating image.
for centering content, use <center>
such as:
<html><head><title>this is a repeating background and centered text example</title></head>
<body background="image.jpg"><center> this text is in the center of the page </center></body></html>
now you can get more technical and use css in your page:
<html><head><title>this is an example using css</title>
<style type="text/css">
body { background-image: url(image.jpg); background-repeat:repeat; text-align: center; }
</style></head>
<body> this text is centered with a repeating background behind it. </body></html>
