/* prototype */

Event.observe(window, 'load', function() {

       var height_bottom_boxes = $('bottom_boxes_mid').getHeight();
       var height_box_vitanas_personal = $('box_startbox_vitanas_personal').getHeight();

       var height_box3 = height_bottom_boxes+5;
       var height_box_jobangebote = height_box3-height_box_vitanas_personal;

       $('box_startbox_jobangebote').setStyle({height: height_box_jobangebote+'px'});

});