Sending some var to php file (problem please help)

I'm calling my remote php script with

<script language="JavaScript" src="myscript.php" type="text/javascript"></script>

Code (markup):

But now I want to call my php script like this:

myscript.php?url=URL OF PAGE

Code (markup):

Url of page I got with:

but now how to do something like this:

<script language="JavaScript" >
var url = window.location.href; 
</script>
<script language="JavaScript" [B]src="myscript.php?url="+url [/B]type="text/javascript"></script>

Code (markup):

This doesnt work.
Please help me.

 

<script type="text/javascript">
var image = new Image();
image.src = 'myscript.php?url=' + window.location.href;
</script>

Code (javascript):

 

That doesnt work.
My php file return chars:
echo 'document.write (\'SOME CONTENT\')';

 

Why don't you use ajax. It seems the best sollution for what you want to do