var imgArray = new Array("images/waterfall_main.jpg", "images/outdoor_main.jpg", "images/header1.jpg", "images/bamboo_main.jpg", "images/teahouse_main.jpg", "images/forest_main.jpg");
var imgArrayLength = imgArray.length;
//var randomNbr = Math.round((imgArrayLength-1) * Math.random());
var randomNbr = Math.floor((Math.random() * imgArrayLength));
//document.imgRandom1.src = imgArray[randomNbr];
document.writeln('<div id="headerImage"><img name="imgRandom1" src="' + imgArray[randomNbr] + '" border="0" /></div>');