Draggable containment using the selector's parent and z-index increment.

draggable.js

$(document).ready (function() {
        $("div,img").draggable({ containment: "parent" });
            var containment = $( "div,img" ).draggable( "option", "containment" );
            $("div,img").draggable( "option", "containment", "parent" );
    $(function($){
        var sqs = $("div,img").mousedown(function(){
            sqs.each(function(){
            if(this.style.zIndex > 0){--this.style.zIndex;}
            });
            this.style.zIndex = 10000;
        });
    });
});