能否给iframe(designMode="on")中的文字设置字体、字号、颜色？（IE5）

1<iframe designmode="on" id="imafool" src="www.csdn.net"></iframe>

1<script>   
2setTimeout("imafool.document.body.style.color='red';",2000);   
3</script>

1<iframe id="demo"></iframe>

1<script language="javascript">demo.document.designMode="on";</script>

1<script language="javascript">   
2var str = "demo.document.body.style.color='red';";   
3str += "demo.document.body.style.fontSize='12px';";   
4str += "demo.document.body.style.fontFamily='宋体';";   
5setTimeout(str, 100);   
6</script>