[Peter Pitt]

How could i send a javascript variable to php?

[BigDaddy]

What sort of variable? An object?

[AmeliaR]

you can store it in an HTML input element, then post it to a php script
Say a 'hidden' input element

[Peter Pitt]

So i just post it?

[AmeliaR]

Yea

[BigDaddy]

http://www.json.org/ is a good protocol for transforming javascript objects into text form.
And then you just post it, either through a form or an XMLHttpRequest

[Peter Pitt]

Hmm
So rather than window.open, i have a form submit?

[BigDaddy]

If you're trying to submit the javascript variable to php and then open a new page, that's probably the best way, yes.

[Peter Pitt]

So is there anyway i can just have a URL for a form rather than a submit button?

[BigDaddy]

Sure
There's a submit() method for forms.