Hi Steve,

Try this.

<script language="JavaScript" type="text/javascript">
<!--
var CurrentValue = 'Full Set of Pool Balls';

function AddValue(StrName){
	window.document.getElementById('item_name').value = ' ' + StrName + ' ' + CurrentValue + '';
}

function AddValue2(StrName){
	window.document.getElementById('item_name').value = ' ID 462' + ' ' + StrName + ' - ' + CurrentValue + '';
}
//-->
    </script>
<select name="D1" size="1" onChange="AddValue(this.value);">
    <option value="Arizona Cardinals">Arizona Cardinals</option>
    <option value="Atlanta Falcons">Atlanta Falcons</option>
    <option value="Baltimore Ravens">Baltimore Ravens</option>
    <option value="Buffalo Bills">Buffalo Bills</option>
    <option value="Carolina Panthers">Carolina Panthers</option>
    <option value="Chicago Bears">Chicago Bears</option>
    <option value="Cincinnati Bengals">Cincinnati Bengals</option>
    <option value="Cleveland Browns">Cleveland Browns</option>
    <option value="Dallas Cowboys">Dallas Cowboys</option>
    <option value="Denver Broncos">Denver Broncos</option>
    <option value="Detroit Lions">Detroit Lions</option>
    <option value="Green Bay Packers">Green Bay Packers</option>
    <option value="Houston Texans">Houston Texans</option>
    <option value="Indianapolis Colts">Indianapolis Colts</option>
    <option value="Jacksonville Jaguars">Jacksonville Jaguars</option>
    <option value="Kansas City Chiefs">Kansas City Chiefs</option>
    <option value="Miami Dolphins">Miami Dolphins</option>
    <option value="Minnesota Vikings">Minnesota Vikings</option>
    <option value="New England Patriots">New England Patriots</option>
    <option value="New Orleans Saints">New Orleans Saints</option>
    <option value="New York Giants">New York Giants</option>
    <option value="New York Jets">New York Jets</option>
    <option value="Oakland Raiders">Oakland Raiders</option>
    <option value="Philadelphia Eagles">Philadelphia Eagles</option>
    <option value="Pittsburgh Steelers">Pittsburgh Steelers</option>
    <option value="San Diego Chargers">San Diego Chargers</option>
    <option value="San Francisco 49ers">San Francisco 49ers</option>
    <option value="Seattle Seahawks">Seattle Seahawks</option>
    <option value="St. Louis Rams">St. Louis Rams</option>
    <option value="Tampa Bay Buccaneers">Tampa Bay Buccaneers</option>
    <option value="Tennessee Titans">Tennessee Titans</option>
    <option value="Washington Redskins">Washington Redskins</option>
</select>

<select name="D1" size="1" onChange="AddValue2(this.value);">
     <option value="Arizona Cardinals" selected>Arizona Cardinals</option>
    <option value="Atlanta Falcons">Atlanta Falcons</option>
    <option value="Baltimore Ravens">Baltimore Ravens</option>
    <option value="Buffalo Bills">Buffalo Bills</option>
    <option value="Carolina Panthers">Carolina Panthers</option>
    <option value="Chicago Bears">Chicago Bears</option>
    <option value="Cincinnati Bengals">Cincinnati Bengals</option>
    <option value="Cleveland Browns">Cleveland Browns</option>
    <option value="Dallas Cowboys">Dallas Cowboys</option>
    <option value="Denver Broncos">Denver Broncos</option>
    <option value="Detroit Lions">Detroit Lions</option>
    <option value="Green Bay Packers">Green Bay Packers</option>
    <option value="Houston Texans">Houston Texans</option>
    <option value="Indianapolis Colts">Indianapolis Colts</option>
    <option value="Jacksonville Jaguars">Jacksonville Jaguars</option>
    <option value="Kansas City Chiefs">Kansas City Chiefs</option>
    <option value="Miami Dolphins">Miami Dolphins</option>
    <option value="Minnesota Vikings">Minnesota Vikings</option>
    <option value="New England Patriots">New England Patriots</option>
    <option value="New Orleans Saints">New Orleans Saints</option>
    <option value="New York Giants">New York Giants</option>
    <option value="New York Jets">New York Jets</option>
    <option value="Oakland Raiders">Oakland Raiders</option>
    <option value="Philadelphia Eagles">Philadelphia Eagles</option>
    <option value="Pittsburgh Steelers">Pittsburgh Steelers</option>
    <option value="San Diego Chargers">San Diego Chargers</option>
    <option value="San Francisco 49ers">San Francisco 49ers</option>
    <option value="Seattle Seahawks">Seattle Seahawks</option>
    <option value="St. Louis Rams">St. Louis Rams</option>
    <option value="Tampa Bay Buccaneers">Tampa Bay Buccaneers</option>
    <option value="Tennessee Titans">Tennessee Titans</option>
    <option value="Washington Redskins">Washington Redskins</option>
</select>
	
<input type="hidden" name="item_name" value="ID 462 Full Set of Pool Balls">

Should work fine. The reason it wasn't working is that you can't have functions with the same name in Javascript.

Hope this helps,

Kind Regards,
Tarran Walker