var rNumber = Math.floor(Math.random()*(imageArray.length - 1) );

// JAVASCRIPT FUNCTIONS FORM HERE ON                                                                                                                                                           


function getImage()
{
    return "<img src='" + imageArray[eval(rNumber)][0] + "' border='0'  width='" + imageArray[eval(rNumber)][1] + "' height='" + imageArray[eval(rNumber)][2] + "'>";

}
document.write(getImage());