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1) i need to add a way for user to filter ads by country, and by 2 other fields. The code already exists to filter by state and by zip code. Just clone it for the 3 other fields.
2) add a company field into a table.
3) display/hide certain fields depending on user's country selection
4) automatically fill in user registration data into certain fields in the ad listing or other forms.
5) Configure 'tell a friend' email form and 'contact us' form.
You should be familiar with how to convert distance into latitude/longitude coordinates. Expert in Smarty templates, php/mysql. Experience with geodesic is preferred.