use php to either change URL of calling html file

Simplified example:

index.html has a form which GET submits to program.php.

i want program.php to then append some info to the URL of index.html, so it will look like this: index.html?info=asdfasdf

then some javascript in index.html will look at it's URL and get the info and do what i want.



what i'm trying to do is actually a lot more complicated. but i know how to do everything except make PHP alter the URL of the HTML page that submitted to it. if the above example is too simple, here's a more detailed explanation of what i'm actually doing--i need to know how do to step #5.

the More Complicated version:

index.html has a form with <input name=username>. it also has an iFrame called iframe.html.

1. on index.html, a user enters his name "bubba" in the name text field.
2. index.html uses javascript to send var name = "bubba" to iframe.html.
3. iframe.html GET posts to program.php : iframe.html?name='bubba'
4. program.php calculates some stuff
5. program.php returns a result of either "submitTo=login1" or "submitTo=login2" in the url of iframe.html: iframe.html?name=bubba&submitTo=login1.
6. iframe.html looks at it's url, makes the javascript variables name = "bubba"; and submitTo = "login1";. It sends these javascript variables to index.html
7. index.html POST submits to login1.php.

so the question is this: how do i get the php to send info to the URL?  (step 5)Start Free Trial