Passing data between Iframes

Iframe 1
 Iframe 2

In the main page

<iframe name="iframe1_name" width="300" height="200" src="page1.htm"></iframe>
<iframe name="iframe2_name" width="300" height="200" src="page2.htm"></iframe>

Iframe1 to Iframe2.
In iframe1 page.

parent.frames["iframe2_name"].document.FormName.ElementName.value=document.FormName.ElementName.value

Iframe2 to IFrame1.
In iframe2 page.

parent.frames["iframe1_name"].document.FormName.ElementName.value=document.FormName.ElementName.value

To run a function in Iframe2 from Iframe 1

parent.frames["iframe2_name"].functionName()