How can i combine Javascript with PHP?

[ParaSnake]

I dont know if this is an easy problem or not,but i tried and i failed,for example,i got some javascript codes that return the value of 1,i call it num=1.
Then if i would like to display it,i would write

<script language = "JavaScript">
document.write(num);
</script>

But i have a PHP file(the same page as the js script above)and an var called $num,how can i give $num the value of num???
thx much.

[BlodoPKNZ]

Since php is server side and javascript is client side, php is always done first since it has to parse the output to send to the recieving user. The one of the ways to send a js var to php would be thru a form. You could fill a hidden field in the form with the javascript variable, then after submit you can get the field contents on another page. Another would be to format a link to the next page so as to give it a get variable, which can then be recieved on the other page by php. There is no way to send javascript to php then parse php without changing pages though.

[ParaSnake]

Uhm..after several times of trying,i`ve done it,but i was too happy to reedit this post,sorry for annoy you :P
Thx for you helps