There are two ways of doing this: One is to use JavaScript, the other is to use HTML. Both ways have their pros and cons.
JavaScript is the easiest to implement, but doesn't work on browsers that have JavaScript turned off, and it messes up the BACK button on the browser. You've seen the JavaScript solution.
function ChangeFrames() {
parent.framename1.location
parent.framename2.location
}
</script>
<a href="Javascript:ChangeFra