function featureImage()
{    
    // Generate a random number between 0 and #features
    var totalFeatures = 3;
    var featureNumber = (Math.round((Math.random()*(totalFeatures-1))+1));

    // Use the random number to generate the filename
    var imageFilename = 'feature_' + featureNumber + ".jpg";
        
    // Load image into the document
    document.write('<a href="managed_text.html"><img src="images/' + imageFilename + '" width="880" height="300" alt="Learn more about Managed Text" /></a>');
}