function adjustIFramesHeightOnLoad(iframe) {
var iframeHeight = Math.min(iframe.contentWindow.window.document.documentElement.scrollHeight, iframe.contentWindow.window.document.body.scrollHeight);
$(iframe).height(iframeHeight);
}

<li><a href="selfinfo.jsp" target="c-c-iframe" title="個人信息" >個人信息</a></li>
<li><a href="modifypass.jsp" target="c-c-iframe" title="修改密碼" >修改密碼</a></li>
<iframe src="init.jsp" id="c-c-iframe" name="c-c-iframe" width="500px;" frameborder="0" scrolling="no" marginwidth="0" marginheight="0"></iframe>

<script type="text/javascript">
<!--
$(function(){
$("#c-c-iframe").load(function(){
$(this).height($(this).contents().find("#content").height() + 40);
});
});
-->
</script>

<script type="text/javascript">
<!--
$(function(){
$("#workArea").load(function(){
var height = $(this).contents().find("#box").height() + 40;
//這樣給以一個最小高度
$(this).height( height < 400 ? 400 : height );
});
});
-->
</script>