redefining session variable values

Hi,

What I need to know is - how do you give a session variable (that has already been registered) an new value ?
This is what I have already tryed -

if (!isset($fontsize))
{
session_register("fontsize");
$fontsize = 1;
}
else
{
$fontsize = $fonts //$fonts is passed in
}

So if I passed in the value of 2 I would expect $fontsize to hold the value of 2. But its still holding one.

any ideas??
SC

Well, of course. Let's say you have $fonts==2 when this bit of code is reached. What happens depends on whether $fontsize is set or not:

1) Is $fontsize set? No.
2) register the $fontsize variable.
3) Set $fontsize=1.
Where did $fontsize get set to 2?

The other scenario:
1) Is $fontsize set? Yes; jump to the "else" branch.
2) Set $fontsize=$fonts
Where did $fontsize get registered?

Thanks, Im still having problem but will keep trying.