variable with multiple values

variable with multiple values

This is a stupid question, nonetheless I need some help. I need a validation rule to return false if the value of the variable IS NOT either USA, CAN or MEX

this doesn't work USA||CAN||MEX
$.validator.addMethod(
        "ReutersNA",
        function(value, element){
            var selectedCountry = $("#Country").val();
            if($("#IQBAS,#IQPRE").is(":checked") && (selectedCountry!="USA||CAN||MEX")) {
           return false;
            } else return true;
        },
        "Cannot select Reuters News outside of North America."
    );

///////////////////////

How can I make an array of the 3 countries?

$.validator.addMethod(
    "ReutersNA",
    function(value, element) {
        var selectedCountry = $("#Country").val();
var NorthAmerica = new Array ("USA,CAN,MEX")
        if ($("#IQBAS,#IQPRE").is(":checked") && (selectedCountry!=NorthAmerica)) {
            return false;
        } else return true;
    },
        "You cannot select Reuters if you live outside of North America."
    );
seems like that should work but doesn't
Kane Leins