var C={
        showHideBlockById: function(block_id){
                var block=U.gbi(block_id);
                if(block.offsetHeight){
                        jQuery(block).hide('slow');
                        U.gbi(block_id).className='rarr';
                }else{
                        jQuery(block).show('slow');
                        U.gbi(block_id).className='darr';
                 }
        }
}