Help with adding cascading to my drop-down-list

I have this drop-down list that works successfully, when someone wants to search by keyword, channel or All. I'd like to add the ability where someone can search by sub-channel.

<form method="get" action="../search.php" name="myForm" />
<input autocomplete="off" id="keyword" name="keyword" value="SEARCH WORDS" onfocus="if (this.value=='SEARCH WORDS') {this.value=''; this.style.color='#696969';}" onclick="clickclear(this, 'Search [var.site_name]')" onblur="clickrecall(this,'Search...
Code (markup):
Help with adding cascading to my drop-down-list

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