You can use javascript to access the parent. You could echo out javascript in your HTML using PHP or ASP.. so your parent page has this:
function changeURL( url ) {
document.location = url;
}
and in your child script, you echo
<script >
parent.changeURL('mypage2.html' );
</script >
The reason you can't call parent.document.location is because it's read only - you have to have a function available on the parent to do it.
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