How to make a function click on a picture in an iframe including a foreign web page

[paratge]

Hi,

I need to do a click on a picture in an iframe without using a mouse
click because this iframe is not visible.

Thus i wrote this :

function updtframe() {
strButton = document.getElementByName("submit").value;
document.getElementById("htmle").contentWindow.document.body.innerHTML
= strButton...;
}

And there I'm stopped idon't know how to make a click.

You understand Javascript is not my natural language...

Thanks in advance.