Problem with header widget

Hi,
I added a widget area in header using this snippet:

// Adds a widget area.
if (function_exists('register_sidebar')) {
 register_sidebar(array(
 'name' => 'Extra Header Widget Area',
 'id' => 'extra-widget-area',
 'description' => 'Extra widget area before the header',
 'before_widget' => '<div class="widget my-extra-widget">',
 'after_widget' => '</div>',
 'before_title' => '<h2>',
 'after_title' => '</h2>'
 ));
}

// Place the widget area after the header
add_action ('__before_header', 'add_my_widget_area', 10);
function add_my_widget_area() {
 if (function_exists('dynamic_sidebar')) {
 dynamic_sidebar('Extra Header Widget Area');
 }
}

Now It has expanded the width of the page, and appears a horizontal scroll bar. The web is http://www.ppspark.com

Thank you very much for your help!!