$(document).ready( function() {

  $("div.fuhrpark a.thickbox").each(function() {
    var foo = $(this).attr("href");
    var foo_id = $(this).attr("id");

    foo_id = foo_id.replace("fuhrpark_","");

    new_link = "/webEdition/we_cmd.php?we_cmd[0]=show&we_cmd[1]="+foo_id+"&we_cmd[4]=718?KeepThis=true&TB_iframe=true&height=600&width=772";

    $(this).attr("href", new_link);
  })

});