randContent = new Array();
randContent[0] = "<img border='0' src='images/random_06.jpg'>";
randContent[1] = "<img border='0' src='images/random_07.jpg'>";
randContent[2] = "<img border='0' src='images/random_08.jpg'>";
randContent[3] = "<img border='0' src='images/random_09.jpg'>";
var numb = randContent.length-1;
var mathRandom = Math.random();
var mathRound = Math.round((mathRandom*numb));
var randDisplay = randContent[mathRound];