edge animate - limit area move object

I have a symbol in the edge with drag function (mouseover-move with mouse), now I want to limit what is the area within my document, where you can move it.

For now this is the code I have:

function(sym, e)
// insert code to be run when the symbol is created here
    yepnope({nope:['jquery-ui-1.10.4.custom.min.js'], complete: init});

function init(){
    sym.$('car').draggable();
    sym.$('car2').draggable();
}

that would be to move the symbol ('car').

Now I need help writing the code to limit the area where it will be possible to drag the object. Grate