Changing an Iframe src using Javascript
<script language="javascript">
function LoadPage(){
var objFrame=document.getElementById("month_frame");
var curdate = new Date();
var month = curdate.getMonth();
objFrame.src=month+".htm";
}
</script>
<script type="text/javascript">
document.body.onload = date; //event handler (calls the function)
function date()
{
var nmonth= getmonth();
var months = new Array("january.htm", "febuary.htm", etc...);
window.frames["calendar"].src = months[nmonth];
}
</script>
Also, I think you may need the name attribute as well for some browsers.
<iframe name="calendar" id="calendar" src="august.htm" height="300" width="350"></iframe>
<body style="margin:0px"> <iframe style="width:100%;height:100%" frameborder=0 src="about:那不就是百分百么？">