Ok, I'm doing a little page using java script and php. Anyway, Ive got a function that is run on the mousedown event of a button..

What I want to know is how to assign a variable in java to a variable in php?

eg:

Code:
function do_co()
{
x=document.form2.x.value
y=document.form2.y.value
z=document.form2.z.value
<?
$co = 'x';
?>
thread_title.innerHTML="<? echo $co; ?>"
}
I want $co to equal the 'x' value in the java script..

Any ideas?