iframe 내용 바꾸기

<script language='javascript'>

<!--

function fncDir(url)

{

    document.getElementById('ifm').src = 'http://'+url;

}

</script>

<form name='frm'>

<a href='#' onclick='fncDir("iframe 경로"); return false;'></a>

<iframe id='ifm' src='' width="" height="" scrolling="auto" frameborder="0"></iframe>

</form>