You can do this from either a parent (push) or a child (pull) perspective. I would imagine that you are planning on using a label (span) within the file that loads inside the iframe. If the child perspective is used, then:
<script language=javascript>
function window_onload(){
document.getElementById("theTitle").innerText=parent.document.title;
}
</script>
<body onload="window_onload">
.
.
.
<span id="theTitle" className=.......></span>
.
.
.
</body>
If the parent perspective is used, then:
<script language=javascript>
function showTitle(){
TitleFrame.document.getElementById("theTitle").innerText=document.title;
}
</script>
<body>
.
.
<IFRAME id="TitleFrame" width=... height=...></IFRAME>
</body>
You still have to make sure that the child document has the <span> with id="theTitle". You can invoke this function either in the parent's onload event or in any other fashion.
Hope it helps.