Unlimited number of levels

COOLjsTree and COOLjsTree Professional support unlimited number of levels. No special actions should be taken in case of big number of levels, just nest the nodes:

var TREE1_NODES = [
    ['Item 1', null, null,
        ['Level 2', null, null,
            ['Level 3', null, null,
                ['Level 4', null, null,
                    ['Level 5', null, null,
                        ...

Don't forget that different levels can have different styles (see example) and different images (in Professional version, see example).