XSL counting some of preceding nodes ?

[GRR]

Please let me know if any one has solution to this :

The input xml has
<Test>
<item level="1" ordered="N">test1</item>
<item level="1" ordered="Y">test2</item>
<item level="2" ordered="Y">level 1</item>
<item level="2" ordered="Y">level 2</item>
<item level="1" ordered="N">test3</item>
<item level="2" ordered="Y">Line 1</item>
<item level="3" ordered="N">Line 2</item>
<item level="3" ordered="N">Line 2.1</item>
<item level="3" ordered="N">Line 2.2</item>
<item level="2" ordered="Y">Line 3</item>
<item level="3" ordered="Y">Line 4.1</item>
<item level="3" ordered="Y">Line 4.2</item>
<item level="4" ordered="Y">Line 4.3</item>
<item level="3" ordered="Y">Line 4.4</item>
<item level="2" ordered="Y">Line 4.5</item>
<item level="2" ordered="Y">Line 5</item>
<item level="1" ordered="N">Line 6</item>
</Test>

If attribute ordered is 'Y' then should out put in numbered otherwise it is bullets.
each new level should start in new tabed place. Iwas able to do most part but unable to get the count in each level.
The count should start at each level.
Any advice on this?

Thanks.