Creating a Multi-Level Combobox in ASP/SQL

[ttigresa]

\[code\]Table categories: id name parent_id \[/code\]values

• 1 - Main Category - 0, 2 - Main Category1 - 1, 3 - Main category2 - 1, 4 - Subcategory 1 - 2, 5 - Subcategory 2 - 2 6 - Main category3 - 1

Combobox Like this\[code\]Main Category --> Main Category 1 -------->SubCategory 1 -------->SubCategory 2 --> Main Category 2 --> Main Category 3\[/code\]How to ??? Thank for answer !