Jquery ui basic draggable

<!-- Javascript -->
<link rel="stylesheet" href="http://code.jquery.com/ui/1.9.2/themes/base/jquery-ui.css" />
<script type="text/javascript" src="http://code.jquery.com/jquery.min.js"></script>
<script type="text/javascript" src="http://code.jquery.com/ui/1.9.2/jquery-ui.js"></script>
<script> 
  $(function () {
      /* basic */
      $("#dragbasic div[id^='drag']").draggable(
          {
            containment: "#dragbasic"
          }
      );
      
      /* X axis only */
      $("#drag-x div[id^='drag']").draggable(
          {
            containment: "#drag-x",
            axis: "x"
          }
      );
      
      /* Y axis only */
      $("#drag-y div[id^='drag']").draggable(
          {
            containment: "#drag-y",
            axis: "y"
          }
      );
      
      
      /* make draggable div always on top */
      $("div[id^='drag']").mousedown(function(){              
          $("div[id^='drag']").each(function(){
          	  var seq = $(this).attr("id").replace("drag", "");
              $(this).css('z-index', seq);    
          });
          
          
      	  $(this).css('z-index', 9999);      
      });
  });
</script>

<!-- HTML -->
<style>
    .drag { 
        width: 70px; 
        height: 70px;     
    	line-height:70px;
        border:1px solid black; 
        cursor:pointer;
        border-radius:10px;
        float:left;
        margin-left:5px;
        text-align:center;
        font-size:12px;
        
    }
    
    #dragbasic{
    	width: 500px; 
        height: 150px;     
        border:1px solid gray; 
        background-color:#E0F0FF;    	
    }
    
    #drag-x{
    	width: 500px; 
        height: 75px;     
        border:1px solid gray; 
    	background-color:#E0F0FF;    	
    }
    
    #drag-y{
    	width: 80px; 
        height: 300px;     
        border:1px solid gray; 
    	background-color:#E0F0FF;
    	float:left;
    }
</style>
<div>Y axis only</div>
<div id="drag-y">        
    <div id="drag4" class="drag" style="background-color:lightgreen">Drag me</div>
	<div id="drag5" class="drag" style="background-color:lightyellow">Drag me</div>
</div>    

<div style="float:left;margin-left:30px;">
    Basic
    <div id="dragbasic">    
        <div id="drag1" class="drag" style="background-color:orange">Drag me</div>
    </div>
    
    X axis only
    <div id="drag-x">    
        <div id="drag2" class="drag" style="background-color:orange">Drag me</div>
        <div id="drag3" class="drag" style="background-color:lightblue">Drag me</div>    
    </div>    
</div>