JQuery - Get select value

I'm trying to get the selected value from a drop down list via jQuery. I have a bit of javascript that validates a form when I click SEND, to make sure there are no blanks, code is as follows:

function formCheckDancer(formobj){                  
            // Enter name of mandatory fields
            var fieldRequired = Array("dancerStageName", "dancerFullName", "dancerPhone", "dancerEmail", "dancerCountry", "dancerAvailableDate");

            // Enter field description to appear in the dialog box
            var fieldDescription = Array("Stage Name", "Full Name", "Phone Number", "Email Address", "Nationality", "Availability");

            // dialog message
            var alertMsg = "Please complete the following fields:\n";           
            var l_Msg = alertMsg.length;

            for (var i = 0; i < fieldRequired.length; i++){
                var obj = formobj.elements[fieldRequired[i]];               
                if (obj){
                    switch(obj.type){
                    case "select-one":                      
                        if (obj.selectedIndex == -1 || obj.options[obj.selectedIndex].text == "" || obj.options[obj.selectedIndex].text == "..."){
                            alertMsg += " - " + fieldDescription[i] + "\n";
                        }
                        break;
                    case "select-multiple":
                        if (obj.selectedIndex == -1){
                            alertMsg += " - " + fieldDescription[i] + "\n";
                        }
                        break;
                    case "text":
                    case "textarea":
                        if (obj.value == "" || obj.value == null){
                            alertMsg += " - " + fieldDescription[i] + "\n";
                        }
                        break;
                    case "checkbox":
                        if (obj.checked == false){                  
                            alertMsg