.preview_bg
{
    position:fixed;
    _position:absolute;
    top:0;
    left:0;
    
    background:#000;
    display:none;
}
.preview_wrap
{
    position:fixed;
    _position:absolute;
    top:50%;
    left:50%;
    padding:15px; 
    background:#FFF;
    cursor:move;
    display:none;
	z-index:999;
    
    background:#FFF url('/images/icon_resize.gif') no-repeat right bottom;
}
    .preview_wrap img
    {
        display:block;
        border:1px solid #888;
        cursor:pointer;
		
    }