Example: Call function in another frame

index.html

//Try:
<frameset col"50%,*">
<frame src="page1.htm">
<frame src="page2.htm" name="otherFrameName">
</frameset>

//Then in page1.htm:
<script language="JavaScript">
parent.otherFrameName.functionName();
</script>

//Then in page2.htm:
<script language="JavaScript">
function functionName() {
    alert('Hello world');
}
</script>