How to change the position of an element with code?

Hi! I'm doing a drag & drop, in this case they send me a question and 4 answer options, the user has to drag the correct answer into a box, then the question change and a new 4 answers appears. But i cant' "reset" the position of my draggable elements for the next question.

Please help me =)

i'm using this code :

yepnope(

{

    nope:[

      'js/jquery-ui-1.9.2.custom.min.js',

      'js/jquery.ui.touch-punch.min.js',

      'css/jquery-ui-1.9.2.custom.min.css'

     ],

    complete: init

}

);

function init() {

          var stage = sym.$("Stage");

          var Rect1 = sym.$("Rect1");

          var Rect2 = sym.$("Rect2");

          var Rect3 = sym.$("Rect3");

          var Rect4 = sym.$("Rect4");

          Rect1.html("1");

          Rect2.html("2");

          Rect3.html("3");

          Rect4.html("4");

          Rect1.css("text-align", "center");

          Rect2.css("text-align", "center");

          Rect3.css("text-align", "center");

          Rect4.css("text-align", "center");

          Rect1.draggable({ containment: stage});

          Rect2.draggable({ containment: stage });

          Rect3.draggable({ containment: stage });

          Rect4.draggable({ containment: stage });

          Rect1.draggable( "option", "revert", "invalid");// If the user doesn't drag the correct answer, it return's to original position, but if he answer right, the draggable have to snap to the box.

          Rect2.draggable( "option", "revert", "invalid");

          Rect3.draggable( "option", "revert", "invalid");

          Rect4.draggable( "option", "revert", "invalid");

   // droppable box

          var dropCase1 = sym.$("dropCase1");

          dropCase1.css("position", "absolute");

          dropCase1.droppable({

                              accept: caso, // my var "caso" is changing according the current question. for that i use a switch /case statement.

                    drop: function(event, ui) {

                              console.log("bien");

                    }

          });

}