PHP 관련 질문 드립니다.

function redirect(x){	
 
alert("In") 
var groups=document.mod_form.fil_Division.options.length 
var group=new Array(groups) 
 
for (i=0; i<groups; i++) 
group[i]=new Array() 
 
group[0][0]=new Option("Player", "P") 
group[0][1]=new Option("Recorder", "R") 
group[0][2]=new Option("AV Receiver", "V") 
group[0][3]=new Option("Bar", "B") 
group[0][4]=new Option("기타", "O") 
 
group[1][0]=new Option("CD", "C") 
group[1][1]=new Option("DVD", "D") 
group[1][2]=new Option("AV", "U") 
group[1][3]=new Option("AVN", "N") 
group[1][4]=new Option("Navigation module box", "X") 
group[1][5]=new Option("Telematics", "E") 
group[1][6]=new Option("기타", "Y") 
 
group[2][0]=new Option("DVR", "H") 
group[2][1]=new Option("Analog Camera", "K") 
group[2][2]=new Option("IP Camera", "I") 
group[2][3]=new Option("VMS", "M") 
group[2][4]=new Option("VCS", "F") 
group[2][5]=new Option("기타", "Z") 
 
for (i=document.mod_form.fil_productType.options.length-1;i>0;i--) 
document.mod_form.fil_productType.options[i]=null 
 
for (i=0;i<group[x].length;i++){ 
document.mod_form.fil_productType.options[i]=new Option(group[x][i].text,group[x][i].value) 
} 
document.mod_form.fil_productType.options[0].selected=true	
} 
 
<tr> 
<td width="20%" bgcolor="#C5C5B5" align="center"> 
<font size="2" color="white"><b>제품군</b></font></td> 
<td width="30%" bgcolor="white" align="left"> 
 
<!--120109 동적 분류--> 
<select name="fil_Division" style="width:80%" onChange="redirect(this.options.selectedIndex)"> 
<option value="Media" >Media</option> 
<option value="Car">Car</option> 
<option value="Security">Security</option> 
</select> 
 
<select name="fil_productType" style="width:80%"> 
<option value="P" <?php $b=($view[productType] == "P") ? "selected":""; echo $b;?>>Player</option> 
        <option value="R" <?php $b=($view[productType] == "R") ? "selected":""; echo $b;?>>Recorder</option> 
        <option value="V" <?php $b=($view[productType] == "V") ? "selected": "";echo $b;?>>AV Receiver </option> 
        <option value="B" <?php $b=($view[productType] == "B") ? "selected": "";echo $b;?>>Bar </option> 
        <option value="O" <?php $b=($view[productType] == "O") ? "selected":""; echo $b;?>>기타</option> 
</select></td> 
</tr>