Drop Down List value to Hide Rows

I've created a drop down list with two options( Single Wall and Double Wall), which I want to hide rows depending on the users selection.

When Single Wall is selected I want to hide rows 10 through 16.
When Double Wall is selected I want to hide rows 18 through 19.

Is there a simple solution to my question? I'm using excel 2003. Attaching the booklet.

Thanks!