Using Modernizr to pick the video type(s) I want to pass the supported file extension to the MYSQL query.

The following code decides which types will run

<script type="text/javascript">
$(document).ready(function()
{
if (Modernizr.video)
{
if (Modernizr.video.ogg) {
// $("#result").html('Your browser has support for ogg ');
}
if (Modernizr.video.webm) {
// $("#result2").html('Your browser has support for webm ');
}
if (Modernizr.video.h264){
// $("#result3").html('Your browser has support for h264');
}
}
else
{
// $("#result3").html('Your browser does not support video');
}
});
</script>

But how do I pass the correct extension ($ext) to the query?
$kazvideo1 = p4::find_kazand_by_cgs($id,$ext);

Thank you