jQuery Ajax 성공!! ( D체크 예제)

function idCheckAjax(){
    var param = "id=" + $("#id").val();
    $.ajax({
        type:"POST",
        data:param,
        url:"idCheck.do",
        success:function(result){
            if(result=="OK"){
                document.getElementById("idcheck").innerHTML="사용가능";
                document.getElementById("idcheck").style.color="blue";

}else{

                document.getElementById("idcheck").innerHTML="중복된아이디";

                document.getElementById("idcheck").style.color="red";

                document.getElementById("id").value = "";

                document.getElementById("id").focus(); 

}

        },

error:function(){

alert("통신오류가 발생하였습니다. 재시도 해주세요");

}

});

}