iframe框架大小自适应

<span id="ospan">

<iframe frameborder=0 height=100% marginheight=1 marginwidth=1 src="right.asp?ID=1" width="569" bordercolor="#000000" name="I4" noresize scrolling=no οnlοad="ospan.style.height=I4.document.body.scrollHeight;">

</iframe>

</span>