$( function() {
    var top = $(window).height() / 2 - 100;
    var windowWidth = $(window).width();
    var left = 0;
    if (windowWidth > 1000) {
        left = (windowWidth - 1000) / 2 + 0;
    }
    try{
    var signInDialog = $("#signInDialog").dialog( {
        title : '회원로그인',
        width : 250,
        height : 200,
        position: [left,top],
        resizable : false,
        autoOpen : false,
        modal : false,
        bgiframe: true,
        overlay : {
            opacity :0.5,
            background :"black"
        }
    });
    } catch(e) {
        alert(e);
    }
});