How to pass a Javascript variable to my controller from my view

[eluser]Unknown[/eluser]
Hi everyone,

I have a Javascript variable called "val" that I want to pass to my controller named "$formSeg4". How can I do that? I keep getting an error.

$formSeg4 = array('training', 'ci', 'index.php', 'trainsession_control', 'viewTrainDateReload');
$formUrl4 = site_url($formSeg4);
?>
[removed]

function reload(form)
{
var val=form.companyDDL.options[form.companyDDL.options.selectedIndex].value;
self.location='<? echo $formUrl4; ?>/?cat' + val;
}
[removed]

Thanks,
Wesley