This is more java JavaScript related than perl, but i have a page where i want to execute java JavaScript when it loads. based on what it does so you could try 

print $q->header( -type =>'text/html');
print <<"EODEOD";
<title>mytitle</title>
<script language="JavaScript">
<!--
function iframeLoad(a) {
window.parent.postMessage({
    'func': 'GetFileLoadStatus',
    'message': 'Message text from iframe.'
}, "*");
}
//-->
</script>
<body onload="iframeLoad()">
EODEOD

[download]

Edit: a was just a temp var, my sub was 

function iframeLoad(a) {
 a = document.getElementById("tableId").innerHTML;
 parent.document.getElementById("tableId").innerHTML = a; 
 parent.document.getElementById("hiframe").src = "about:blank"; 
}

[download]
In the parent i had 
 
...
 function showTable(loc) {
  document.getElementById("tableId").innerHTML="Waiting on:" + loc;
  document.getElementById("hiframe").src = loc; 
  }
...
<input type="button" value="run program" onclick="showTable('/cgi-bin/
+program.pl?parm1=1')">
<iframe id="hiframe" src="about:blank" style="visibility:hidden;displa
+y:none"></iframe>
<div id="tableId" style="background-color:lightgray"></div>
....

[download]
and the cgi call also returned 
 
....
<div id="tableId">
<pre> 
some stuff to display 
more stuff 
</pre></div>

[download]

In reply to Re^3: send windowmessage from cgi back to form that called the cgi by huck
in thread send windowmessage from cgi back to form that called the cgi by tultalk

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