CodingForums.com - Selected option

Hello, I am new with javascript and have been trying all day to figure out how do this problem. I am not sure to use the switch or just if function? Basically I want a drop down to give a list of all ipod nano's and based on what generation is selected I want to display the correct storage space in checkboxes under my selection. I was able to get one option to come and go but after adding more I got lost.

This is part of the html:
(I am trying to use the div tag's display to hide and populate the area once its selected)

Code:



<form action="#" method="post" enctype="multipart/form-data" name="deviceForm">

<fieldset>



<legend>Please select your device?</legend>

<p>

    <label for="nano">Nano</label>

        <select onchange="nanoIpod(this);" name="nanoIpod" class="medium">

                      <option value="nothing"></option>

                          <option value="nano1">iPod nano</option>

                          <option value="nano2">iPod nano 2nd generation</option>

                          <option value="nano3">iPod nano 3rd generation</option>

            <option value="nano4">iPod nano 4th generation</option>

            <option value="nano5">iPod nano 5th generation</option>

            <option value="nano6">iPod nano 6th generation</option>

                 </select>

<div id="nothingDiv" name="nothingDiv" style="display: none">

                <input name="1GB" type="checkbox" id="1GB" value="" />

                <label for="1GB">1GB</label>

                <input name="2GB" type="checkbox" id="2GB" value="" />

                <label for="2GB">2GB</label>

        <input name="4GB" type="checkbox" id="4GB" value="" />

               <label for="4GB">4GB</label>

</div>                

<div id="nano1Div" name="nano1Div" style="display: none">

                <input name="4GB" type="checkbox" id="4GB" value="" />

                <label for="4GB">4GB</label>

                <input name="8GB" type="checkbox" id="8GB" value="" />

                <label for="8GB">2GB</label>

        <input name="16GB" type="checkbox" id="16GB" value="" />

               <label for="16GB">16GB</label>

</div>                

<p> 

</code>

thanks in advance for your help







<code>

function preparepage() {

        

        

        

        

        



var ind=document.getElementById("nanoIpod").options[document.getElementById("nanoIpod").selectedIndex].value;





function nanoIpod (obj){

        if(ind=0){

                document.getElementById("nothingDiv").style.display = 'none';

                                                };

                                

                

}

        

        

 







}



window.onload = function () {

                

        preparepage();



}