<script src="http://ajax.googleapis.com/ajax/libs/jquery/2.1.3/jquery.min.js"></script> <script>

// ajax call for a server side script with State and County parameters

function ckCounty(st,cunty) {

    $.ajax({ 
            url: 'whateverScript.file?state='+st+'&county='+cunty, 

            success: function(rtn) {
                    if (rtn > 0) 
                    { 
                            return 'green';                 
                    }      
            } 
    }); 

}

var Color = 'grey'; Color = ckCounty('ga','TAYLOR');

console.log(Color);

</script>