框架中的源地址src是变量值时怎样写？

[bmzhao]

<SCRIPT LANGUAGE="JavaScript">
var address="http://www.csdn.net"
</SCRIPT>

在网页中有这句
<FRAME id="iframe" name="body" src=address>

我想把src的地址写成address的值怎么做？address是变量，值可以变。

[KimSoft]

window.onload = function(){
document.getElementById("iframe").src = address;
}

[supNate]

<FRAME id="iframe" name="body" src=<script>document.write(address)</script>>