.. nadie me puede ayudar con esto ?¿..

[tsoftysoft]

Hola; tendrias primero que definir la imagen los parametros de la imagen:

define('HEADER_TEXTCOLOR', '009193');
define('HEADER_IMAGE', '%s/images/spring_flavour/header_bg.jpg'); // %s is theme dir uri
define('HEADER_IMAGE_WIDTH', 690);
define('HEADER_IMAGE_HEIGHT', 115);

Este es el script final, solo lo tenes que relacionar con lo que tenes...

<?php

$themecolors = array(
'bg' => 'ffffff',
'text' => '000000',
'link' => 'ff3333'
);

load_theme_textdomain('benevolence');

function benevolence_widgets_init() {
register_sidebars(1);
register_sidebar_widget(__('Search'), 'benevolence_search', null, 'search');
unregister_widget_control('search');
}
add_action('widgets_init', 'benevolence_widgets_init');

function benevolence_search() {
?>
<li>
<form id="searchform" method="get" action="<?php bloginfo('url'); ?>">
<h2><?php _e('Search:','benevolence'); ?></h2>
<input type="text" class="input" name="s" id="search" size="15" />
<input name="submit" type="submit" tabindex="5" value="<?php _e('GO','benevolence'); ?>" />
</form>
</li>
<?php
}

?>
<?php

define('HEADER_TEXTCOLOR', '000000');
define('HEADER_IMAGE', '%s/images/masthead.jpg'); // %s is theme dir uri
define('HEADER_IMAGE_WIDTH', 700);
define('HEADER_IMAGE_HEIGHT', 225);

function header_style() {
?>
<style type="text/css">
#masthead{
background: url(<?php header_image() ?>) no-repeat;
}
<?php if ( 'blank' == get_theme_mod('header_textcolor', HEADER_TEXTCOLOR) ) { ?>
#blogTitle, #blogTitle a {
display: none;
}
<?php } else { ?>
#masthead h1#blogTitle, #masthead #blogTitle a, #blogTitle a:hover {
color: #<?php header_textcolor() ?>;
}

<?php } ?>
</style>
<?php
}

function benevolence_admin_header_style() {
?>
<style type="text/css">

#headimg {
position: relative;
top: 0px;
background: url(<?php header_image() ?>);
width: 700px;
height: 225px;
margin: 0px;
margin-top: 0px;
}

#headimg h1 {
position: relative;
top: 50px;
left: 20px;
font-family: 'Arial Black';
color: #<?php header_textcolor() ?>;
font-size: 8pt;
text-transform: uppercase;
text-align: left;
}

#headimg h1 a {
color: #<?php header_textcolor() ?>;
border-bottom: none;
}

#desc { display: none; }

<?php if ( 'blank' == get_header_textcolor() ) { ?>
#headimg h1, #headimg #desc {
display: none;
}
#headimg h1 a, #headimg #desc {
color:#<?php echo HEADER_TEXTCOLOR ?>;
}
<?php } ?>

</style>
<?php
}

add_custom_image_header('header_style', 'benevolence_admin_header_style');

?>


Saludos!!