hopefully simple question about javascript and frames

[cruddell001]

I'm building a webpage using javascript and iframes. Basically I have an iframe in the middle of the index.html page that links to another html page (let's call it iframe.html). My question is, is it possible to call a javascript function from iframe.html to control an object on index.html? If so, how do I do this? I'd like to be able to assign an image in iframe.html with the hyperlink of href="javascript:function()", where the function effects the CSS of a div on index.html.

Thanks

[Fang]

Adds a handler to the first image in index.html

parent.document.getElementsByTagName('img')[0].onclick=function(){parent.foo();};

The pseudo-protocol javascript: is unnecessary in 99% of cases; no need to use it.
Add function calls to a handler, onclick, onmouseover etc., not to the anchor event.