var isDown  = false;

var tmpX; // delta X
var tmpY; // delta Y

// mouseup
function mouseup()
{
    isDown  = false;
}

// mousedown
function mousedown(event, child)
{
    isDown  = true;
    
    var parent  = child.parentNode;
    
    var parentX = parseInt(parent.style.left);
    var parentY = parseInt(parent.style.top);
    
    var X       = parseInt(event.screenX);
    var Y       = parseInt(event.screenY);
    
    tmpX        = parentX   - X;
    tmpY        = parentY   - Y;
	
	
	// cac div con lai se nam o duoi
	var other   = document.getElementsByTagName('div');
	for( var i = 0; i < other.length; i++)
	{
	    other[i].style.zIndex   = 0;
	}
	
	// duy nhat div hien tai se noi len
	parent.style.zIndex = 10;
	
    
}

function mouseout ()
{
    isDown  = false;
}


function mousemove (event, child) {
    if(isDown) {
       var parent   = child.parentNode;
       
       var X        = event.screenX;
       var Y        = event.screenY;
       
       parent.style.left    = tmpX  + X + 'px';
       parent.style.top     = tmpY  + Y + 'px';
       
    }
    
}

function boxClose(obj)
{
	obj.style.display = 'none';	
}
// add this to load function
addLoadF(prepare_moving_effect);