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What does the question mark mean in this piece of code?
<SCRIPT language=JavaScript>
function reload(form)
{
var val=form.cat.options[form.cat.options.selectedIndex].value;
self.location='dd.php?cat=' + val;
}
</script>
It indicates the start of a query string in a URI.
Since it is part of a string, it holds no special significance for the JavaScript.