javascript to achieve free falling block effect_javascript skills

You can try pressing the left mouse button, then drag out a block and release it to see the effect

<meta http-equiv="Content-Type" content="text/html; charset=gb2312"> <title>Simple xhtml page</title> <style> div.container{ position:absolute; border:1px solid #333; font-size:0px; filter: alpha(opacity=60); opacity: 0.6; } </style>