how to set a taxonomy term active? In my block i have different taxonomy term:
term A
-term B
--term c
---term D
when i am on term b it is set to active or bold if i am on term d then it is set to active and bold.
this is already been used
$options = array();
if (arg(0) == 'taxonomy' &amp;&amp; arg(1) == 'term' &amp;&amp; arg(2) == $t-&gt;tid) {
    $options = array('attributes' =&gt; array('class' =&gt; 'active'));
}

i am new in drupal anyone tell me how it is possible?
The arg() function is taking argument parts from the url.
/taxonomy/term/2 means:
arg(0) = taxonomy
arg(1) = term
arg(2) = 2