var checked_places = [];
function showInfo( str, obj ){
    $( 'div.info' ).remove ();
    var top  = obj.offsetTop;
	var left = obj.offsetLeft;
	var cloud = $( '<div class="info">' + str + '</div>' );
	cloud.css ( { top: ( top - 65 ) + 'px', left: ( left - 25 ) + 'px' } );
    $( '#hall_container' ).append ( cloud );
}

function hideInfo(){ $( 'div.info' ).remove ();}

function checkPlace( id, obj, zone, row, place, price ){
    var key = jQuery.inArray ( id, checked_places );
    if ( key < 0 ){
      $( obj ).css ( 'backgroundPosition', 'left -11px' );
      checked_places.push ( id );
    } else {
        $( obj ).css ( 'backgroundPosition', 'left 0' );
        delete checked_places[key];
    }
}