<!– header image –>
<div class=”swiftbiz-front-bgimg”>
<img alt=”<?php echo esc_attr( get_bloginfo( ‘name’, ‘display’ ) ); ?>” class=”ad-slider-image” src=”<?php header_image(); ?>” width=”<?php echo get_custom_header()->width; ?>” height=”<?php echo get_custom_header()->height; ?>” />
where you see: width=”<
(on the forth row) add the width example:
width=630″<?php echo……
for height enter the height on the fifth row.