How to center this specific code

[system]

Hey, I’ve got problems with centering of slideshow included in The Piecemaker Image Rotator plugin for wordpress. I managed to get the code to see it in header, but I need to center it.
The code looks like this

<?php if ( is_home() ) { display_piecemaker(array('id' => 4)); } ?>

I just need to center it, but

before doesn’t work. This code in “slide.php” is connected with function:

[code]/**
* Function to use piece maker outside post content
*
**/

function display_piecemaker($att = null){
	global $pm;

	if(!is_array($att)){
		$att = array(
			'id' => $att,
		);
	}

	echo $pm->replaceBooks($att);
}

[/code]

Thank you very much for help. I am desperate…