Android :: Passing Intent Value To Another Class

I have four groups in a listview each with four url's I want to load in a webView. When the user select a url to goto I set a value like so;

if (position == 0) webb = webb +2;
{
Intent intent = new Intent(this, official.class);
startActivity(intent);
}

I then carryout the intent to move to the webView class where I have given each URL a value like so;

if (webb == 2) mWebView.loadUrl("http://yahoo.com");
if (webb == 3) mWebView.loadUrl("http://www.bbc.co.uk");

But the screen stays blank, if I state the value inside the official.class it works. How can I get this value to pass to another class based on the selection the user makes from the listview.