How to apply a style to a single page only

[Kirk Y]

Sure, just add a check using the $faqparent var.

if (THIS_SCRIPT == 'faq' AND $faqparent == X){
$styleid = Y;
}

For multiple:

if (THIS_SCRIPT == 'faq')
{
    switch ($faqparent)
    {
        case X:
            $styleid = A;
            break;
        case Y:
            $styleid = B;
            break;
        case Z:
            $styleid = C;
            break;
    }
}