Template User Interface

I need a Template Manage User Interface thorugh which new Template can be added, existing template can be modified & previewed. The code need to be integrated in to an existing project. Template handling functionality with database operation is already implemented using velocity Template. So developer only need to check the existing code & organize it in the following manner: 1. It will be a user Interface with Existing Template Name Dropdown(From template table), Template Name(Text Box), Template Text Area (html enabled), Save Button. 2. If existing Template is selected then Data will be auto populated in the Text Box & Text Area. Any update will be saved upon pressing the save button. 3. During Preview a selection box will be there to select for which user the template preview is required.