4 combos desplegables

Question

hola a todos, bueno, tengo este codigo y quiciera saber si alguien me puede dar una mano para agregarle un combo intermedio mas, gracias.

<FORM name="isc">

<table border="0" cellspacing="0" cellpadding="0">

<tr align="center">

<td nowrap height="11"> &nbsp;

<select name="example" size="1" onChange="redirect(this.options.selectedIndex)">

<option selected>Seleccioné</option>

<option>Sitios Webmaster</option>

<option>Sitios Nuevos</option>

</select>

<select name="stage2" size="1" onChange="redirect1(this.options.selectedIndex)">

<option value=" " selected> </option>

<option value=" " selected>Seleccioné</option>

<option value=" " selected>Seleccioné</option>

</select>

<select name="stage3" size="1" onChange="redirect2(this.options.selectedIndex)">

<option value=" " selected> </option>

<option value=" " selected>Seleccioné</option>

<option value=" " selected>Seleccioné</option>

</select>

<script>

<!--

/*

Triple Combo Script Credit

By Hamid Cheheltani/ JavaScript Kit (http://www.javascriptkit.com)

Visit http://javascriptkit.com for this and over 400+ other scripts

*/

var groups=document.isc.example.options.length

var group=new Array(groups)

for (i=0; i<groups; i++)

group[i]=new Array()

group[0][0]=new Option("Seleccioné"," ");

group[1][0]=new Option("Seleccioné"," ");

group[1][1]=new Option("JavaScript","47");

group[1][2]=new Option("DHTML","46");

group[1][3]=new Option("CGI","45");

group[2][0]=new Option("Seleccioné"," ");

group[2][1]=new Option("Noticias en General","115");

group[2][2]=new Option("Noticias en Technologia","116");

var temp=document.isc.stage2

function redirect(x){

for (m=temp.options.length-1;m>0;m--)

temp.options[m]=null

for (i=0;i<group[x].length;i++){

temp.options[i]=new Option(group[x][i].text,group[x][i].value)

}

temp.options[0].selected=true

redirect1(0)

}

var secondGroups=document.isc.stage2.options.length

var secondGroup=new Array(groups)

for (i=0; i<groups; i++) {

secondGroup[i]=new Array(group[i].length)

for (j=0; j<group[i].length; j++) {

secondGroup[i][j]=new Array() }}

secondGroup[0][0][0]=new Option("Seleccioné"," ");

secondGroup[1][0][0]=new Option("Seleccioné"," ");

secondGroup[1][1][0]=new Option("Seleccioné"," ");

secondGroup[1][1][1]=new Option("JavaScript","http://javascriptkit.com");

secondGroup[1][1][2]=new Option("JavaScript no para programadores","http://webteacher.com/javascript/");

secondGroup[1][1][3]=new Option("JavaScripts","http://java-scripts.net");

secondGroup[1][2][0]=new Option("Seleccioné"," ");

secondGroup[1][2][1]=new Option("Dynamic Drive","http://www.dynamicdrive.com");

secondGroup[1][2][2]=new Option("Guia en DHTML","http://www.geocities.com/ResearchTriangle/Facility/4490/");

secondGroup[1][2][3]=new Option("Web Coder","http://webcoder.com/");

secondGroup[1][3][0]=new Option("Seleccioné"," ");

secondGroup[1][3][1]=new Option("Recursos CGI","http://www.cgi-resources.com");

secondGroup[1][3][2]=new Option("Iniciación a CGI","http://adashimar.hypermart.net/");

secondGroup[2][0][0]=new Option("Seleccioné"," ");

secondGroup[2][1][0]=new Option("Seleccioné"," ");

secondGroup[2][1][1]=new Option("CNN","http://www.cnn.com");

secondGroup[2][1][2]=new Option("MSNBC","http://www.msnbc.com");

secondGroup[2][1][3]=new Option("ABC News","http://www.abcnews.com");

secondGroup[2][2][0]=new Option("Seleccioné"," ");

secondGroup[2][2][1]=new Option("News.com","http://www.news.com");

secondGroup[2][2][2]=new Option("Wired","http://www.wired.com");

var temp1=document.isc.stage3

function redirect1(y){

for (m=temp1.options.length-1;m>0;m--)

temp1.options[m]=null

for (i=0;i<secondGroup[document.isc.example.options.selectedIndex][y].length;i++){

temp1.options[i]=new Option(secondGroup[document.isc.example.options.selectedIndex][y][i].text,secondGroup

[document.isc.example.options.selectedIndex][y][i].value)

}

temp1.options[0].selected=true

}

function redirect2(z){

window.location=temp1[z].value

}

//-->

</script>

</td>

</tr>

</table>

</FORM>