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Creating Multiple Tabs in HTML

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HTML Document is here:-

<!DOCTYPE html>
<html>
    <head>
        <title>Tabs</title>
        <link rel=alternate href="hello.html" hreflang=en type=text/html title="English HTML">
        <link type="text/css" href="tabs.css" rel="stylesheet" />
        <meta charset="UTF-8"/>
    </head>
    <body style="margin: 0;">
    <center>
        <script src="tabs.js"></script>
        <ul id='tabs'>
            <li><a href="#one">Tab 1</a></li>
            <li><a href="#two">Tab 2</a></li>
            <li><a href="#three">Tab 3</a></li>
            <li><a href="#four">Tab 4</a></li>
            <li><a href="#five">Tab 5</a></li>
        </ul>
        <div id='one' class="tabContent">
            <p>Tab One</p>
        </div>
        <div id='two' class="tabContent">
            <p>Tab Two</p>
        </div>
        <div id='three' class="tabContent">
            <p>Tab Three</p>
        </div>
        <div id='four' class="tabContent">
            <p>Tab Four</p>
        </div>
        <div id='five' class="tabContent">
            <p>Tab Five</p>
        </div>
    </center>
</body>
</html>

 Here is the JavaScript

var tabLinks=new Array();
var contentDivs=new Array();
onload=function init(){
    var tabListItems=document.getElementById('tabs').childNodes;
    for(var i=0; i<tabListItems.length; i++){
        if(tabListItems[i].nodeName=="LI"){
            var tabLink=getFirstChildWithTagName(tabListItems[i], "A");
            var id=getHash(tabLink.getAttribute('href'));
            tabLinks[id]=tabLink;
            contentDivs[id]=document.getElementById(id);
        }
    }
    var i=0;
    for(var id in tabLinks){
        tabLinks[id].onclick=showTab;
        tabLinks[id].onfocus=function(){
            this.blur();
        };
        if(i==0)
            tabLinks[id].className='selected';
        i++;
    }
    var i=0;
    for(var id in contentDivs){
        if(i!=0)
            contentDivs[id].className="tabContent hide";
        i++;
    }
}
function showTab(){
    var selectedId=getHash(this.getAttribute('href'));
    for(var id in contentDivs){
        if(id==selectedId){
            tabLinks[id].className='selected';
            contentDivs[id].className='tabContent';
        } else{
            tabLinks[id].className='';
            contentDivs[id].className='tabContent hide';
        }
    }
    return false;
}
function getFirstChildWithTagName(element, tagName){
    for(var i=0; i<element.childNodes.length; i++){
        if(element.childNodes[i].nodeName==tagName)
            return element.childNodes[i];
    }
    return null;
}
function getHash(url){
    var hashPos=url.lastIndexOf('#');
    return url.substring(hashPos+1);             
}

And Here is the CSS

ul#tabs{
    font-family: Lucida Sans Unicode, Lucida Grande, sans-serif;
    font-size: 1.2em;
    list-style-type: none;
    margin: 0 0 0 0;
    padding: 0;
    width: 750px;
}

ul#tabs li{
    float: left;
    padding: 0;
    margin: 0 2px 0 0;
}

ul#tabs li a{
    color: white;
    margin: 0;
    padding: 5px 20px;
    background-color: #3b5998;
    border-top: 6px #3b5998 solid;
    font-weight: bolder;
    display: block;
}

ul#tabs li a:hover{
    color: white;
    background-color: #294a8f;
    border-top: 6px #294a8f solid;
    text-decoration: none;
}

ul#tabs li a.selected{
    color: white;
    background-color: #294a8f;
    border-top: #294a8f solid;
    border-bottom: 3px #294a8f solid;
    text-decoration: none;
}

div.tabContent{
    width: 710px;
    clear: both;
    border: 10px #294a8f solid;
    padding: 10px;
    margin: 0;
}

div.tabContent.hide{
    display: none;
}

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