Maintaining Index Value With Partial Views In MVC2 Using Spark?

I am looking for a way to save index information when iterating through items in a ASP.net MVC 2 using the SPARK view engine. I often have a partial view that iterates through items and a button to add new items.

I want to save the index after displaying the existing items and then pass it back to the same partial view to create and display a new item.

For instance:

<div class="small">Enter the rooms associated with this facility.</div>
<div class="add">
<div id="rooms">
<AddRoom each="var roomModel in Model.FacilityRooms" RoomModel="roomModel" Index="roomModelIndex" />
</div>
<div class="add">
<a id="addRoom" class="add" href="events/room/add.mvc">Add a room</a>
</div>
</div>
<p>
<input type="submit" value="Submit" />
</p>
</form>

I would like to save the Index from the AddRoom loop and use it for the "Add a room" button which calls the AddRoom view again with a blank room object.