Validate dropdownlist selectedvalue against a list from static property

I am using javascript to validate user input on my aspx page. I am easily able to validate textboxes and dropdown list for differenet scenarios.

Now, on one of my dropdown lists (for country), I need to check if it is an allowed country or not for a particular service. I have stored the valid country list in a static property. Is there a way to validate my dropdownlist selected value against that static property?

Any help would be much appreciated.

Cheers, Abhi.

function validateService(source, args) 
{
 开发者_JAVA百科           var country = document.getElementById('<%= ddDestCountry.ClientID %>');
            var service = document.getElementById('<%= ddService.ClientID %>');
// Get allowed country list from my static class
            var countryList = document.getElementById('<%= StaticProperties.EUCountryList %>');

            if (service.value == "P") 
            {
               // I want to do something like this
                if (!countrylist.Contains(country.value)) 
                {
                    args.IsValid = false;
                }
                else {
                    args.IsValid = true;
                }
            }
            return;
        }

Update(Additional Information): The static property is read-only so it cannot be tampered with from the page.

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This validation should be done on the server side and not on the client side. there's nothing preventing me from using greasemonkey to change your static list while I have your page up and inserting "Oz" as a country in your "validating" list