is there is any way to get the width and height of a resizable div

is there is any way to get the width and height of a resizable div while resizing开发者_C百科 i try the following code but it resulted as undefined in alert box i am using jQuery resizable

$("#msc_div").resizable({
     start: function() {
        var offset = $(this).offset();
        alert(offset.height);
        alert(offset.width);
     }
});

$("#msc_div").resizable({
    start: function() {

        var t = $(this);

        alert( t.height() );
        alert( t.width() );

    }
});

See:

• http://api.jquery.com/height/
• http://api.jquery.com/width/