asp.net iframe设置透明

<iframe src="page.aspx" name="kuang" scrolling="no" frameborder="0" width="400" allowtransparency="true" style="background-color: transparent;" height="150"></iframe>

日期类
dim   ts   as   timespan  
  ts=Convert.ToDateTime(datatime2)-Convert.ToDateTime(datatime1)  
  dim   tsstr   as   string  
  tsstr=ts.ToString();