How to disable user from right click on webpage

Here is the extract of the code which does it.
<script type="text/javascript">

function md(e)
{
try { if (event.button==2||event.button==3) return false; }
catch (e) { if (e.which == 3) return false; }
}
document.oncontextmenu = function() { return false; }
document.ondragstart = function() { return false; }
document.onmousedown = md;

</script>

How to add a Bookmarks and SetAsHomePage link on webpage

<script>
function addfav()
{
var BookmarkURL = "http://www.learnjavaindetail.blogspot.com"
var BookmarkTitle = "Java FAQ's"
if (document.all)
{
// Add to Favorites (Internet Explorer)
window.external.AddFavorite(BookmarkURL, BookmarkTitle)
}
else
{
// Add to Bookmarks (Mozilla Firefox)
window.sidebar.addPanel(BookmarkTitle, BookmarkURL, '');
}
}

function setHomepage()
{
if (document.all)
{
document.body.style.behavior = 'url(#default#homepage)';
document.body.setHomePage('http://www.learnjavaindetail.blogspot.com');
}
else if (window.sidebar)
{
if (window.netscape)
{
try
{
netscape.security.PrivilegeManager.enablePrivilege("UniversalXPConnect");
}
catch(e)
{
alert("this action was aviod by your browser,if you want to enable,please enter about:config in your address line,and change the value of signed.applets.codebase_principal_support to true");
}
}
var prefs = Components.classes['@mozilla.org/preferences-service;1'].getService(Components.interfaces.nsIPrefBranch);
prefs.setCharPref('browser.startup.homepage', 'http://www.learnjavaindetail.blogspot.com');
}
}
</script>
<a href="javascript:addfav()">Add To Favorites</a>
<a href="javascript:setHomepage()">Set As Homepage</a>