Add custom profile header

Hi Guys,

I have this code from WordPress which allows the upload of a header in the backend of wordpress. However, if one user uploads it updates everyones headers.

How can i make it different for every profile?

//make changeable header

define('HEADER_TEXTCOLOR', '');
define('HEADER_IMAGE', '/setta.jpg'); // %s is theme dir uri
define('HEADER_IMAGE_WIDTH', 780);
define('HEADER_IMAGE_HEIGHT', 373);
define( 'NO_HEADER_TEXT', true );

function default_admin_header_style() {
?>
<style type="text/css">
#headimg {

}

#headimg h1, #headimg #desc {
	display: none;
}

</style>
<?php
}

function header_style() {
?>
<style type="text/css">
#header{
	background: url(<?php header_image() ?>) no-repeat;
	height: 349px;
	width: <?php echo HEADER_IMAGE_WIDTH; ?>px;
	margin: auto;
	margin-top: 40px;

}

#headimg {
	height: <?php echo HEADER_IMAGE_HEIGHT; ?>px;
	width: <?php echo HEADER_IMAGE_WIDTH; ?>px;
}
</style>
<?php
}

add_custom_image_header('header_style', 'default_admin_header_style');