functions.php poblem – Links take to a blank page…

when i try to add a post or update something on the site it takes me to a blank white page. i know that this problem is caused by something in the functions.php file but i cant find the problem

this my functions.php file

<?php
function load_on_init() {

	if ( function_exists( 'add_theme_support' ) ) {

	add_theme_support( 'menus' );

	}

if ( function_exists( 'register_sidebar' ) ) {	

register_sidebar( array(	

'name' => 'Sidebar',	

'before_widget' => '',	

'after_widget' => '',	

'before_title' => '<h3>',
	'after_title' => '</h3>',

	) );

	register_sidebar( array(	

'name' => 'Footer',

'before_widget' => '',	

'after_widget' => '',	

'before_title' => '',

'after_title' => '',

	) );

}

}

add_theme_support('post-thumbnails');

add_filter( 'post_thumbnail_html', 'my_post_image_html', 10, 3 );

function my_post_image_html( $html, $post_id, $post_image_id ) {

  $html = '<a href="' . get_permalink( $post_id ) . '" title="' . esc_attr( get_post_field( 'post_title', $post_id ) ) . '">' . $html . '</a>';

  return $html;

}

// Puts link in excerpts more tag

function new_excerpt_more($more) {

       global $post;

return '<a class="moretag" href="'. get_permalink($post->ID) . '">       ...   اقرأ المزيد    </a>';

}
add_filter('excerpt_more', 'new_excerpt_more');
add_action( 'init', 'load_on_init' );

?>

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