index.htm
<script>
function func_of_parent() {
alert("I am called from parent");
}
</script>
<body>
<iframe src="iframe.htm" frameborder="0">your browser doesn't support iframe!</iframe>
</body>
iframe.htm
<script>
var x = 0;
function zzz() {
if (0 == x++) {
setTimeout("zzz()", 3000);
} else {
parent.func_of_parent();
}
}
zzz();
</script>
bla bla bla