help pulling XML

[blckspder]

hello,
I have a javascript that pulls links for a site im building from an xml file... im am running into a problem when i try to pull the subLink elements... if they are empty the for loop stops and doesn't out put the rest of the links.. I have tried an if statement with a continue then I tried a break.. neither seemed to work. here are the too files:

<mainNavigation>
    <link>
        <name>Home</name>
        <url>http://www.hydrocephalus-network.org</url>
        <subName />
        <subUrl />    
    </link>
    
    <link>
        <name>News</name>
        <url>http://www.hydrocephalus-network.org/news/</url>
        <subName>RSS Feed</subName>
        <subUrl>http://www.hydrocephalus-network.org/news/feed.php</subUrl>
    </link>
    
    <link>
        <name>Hydrocephalus Information</name>
        <url>http://www.hydrocephalus-network.org/info.php</url>
        <subName>test</subName>
        <subUrl />    
    </link>
    
    <link>
        <name>Professional Community</name>
        <url>http://www.hydrocephalus-network.org/proCommunity.php</url>
        <subName />
        <subUrl />    
    </link>
    
    <link>
        <name>Your Story</name>
        <url>http://www.hydrocephalus-network.org/stories.php</url>
        <subName />
        <subUrl />
    </link>
    
    <link>
        <name>Network Events</name>
        <url>http://www.hydrocephalus-network.org/events.php</url>
        <subName />
        <subUrl />
    </link>
    
    <link>
        <name>Message Board</name>
        <url>http://www.hydrocephalus-network.org</url>
        <subName />
        <subUrl />
    </link>
    
    <link>
        <name>Contact Us</name>
        <url>http://www.hydrocephalus-network.org/contact.php</url>
    </link>
</mainNavigation> 

and the java:

var xmlDoc;
if (window.ActiveXObject) {
    xmlDoc=new ActiveXObject("Microsoft.XMLDOM");
    xmlDoc.async=false;
    xmlDoc.load("xmlData/mainLinks.xml");
    
    //main categoies
    var x = xmlDoc.getElementsByTagName('name');
    var y = xmlDoc.getElementsByTagName('url');
    var links = xmlDoc.getElementsByTagName('link');
    
    //sub links
    var subName = xmlDoc.getElementsByTagName('subName');
    var subUrl = xmlDoc.getElementsByTagName('subUrl');

    }
// code for Mozilla, Firefox, Opera, etc.
    else if (document.implementation && document.implementation.createDocument) {
        xmlDoc=document.implementation.createDocument("","",null);
        xmlDoc.async=false;
        xmlDoc.load("xmlData/mainLinks.xml");
                            
        } else {
            alert('Your browser cannot view the News Section. Please upgrade to the latest Internet Explorer or Mozilla FireFox');
            }
//main links                                
var x = xmlDoc.getElementsByTagName('name');
var y = xmlDoc.getElementsByTagName('url');
var links = xmlDoc.getElementsByTagName('link');

//sub links
var subName = xmlDoc.getElementsByTagName('subName');
var subUrl = xmlDoc.getElementsByTagName('subUrl');
                                                        
for (var i=0;i<links.length;i++) {
    document.write('-&nbsp;<b><a href="');
    document.write(y[i].childNodes[0].nodeValue);
    document.write('" class="navLink">');
    document.write(x[i].childNodes[0].nodeValue);
    document.write('</a></b><br />');
    } 

an example of the out put i am trying to get is as follows:

- News
RSS Feed

News is the main link and RSS Feed is the sub link indented... if anyone can help i would appreciate it.. thanks