var theImages1 = new Array() theImages1[0] = 'images/header_random_01.jpg' theImages1[1] = 'images/header_random_02.jpg' theImages1[2] = 'images/header_random_03.jpg' theImages1[3] = 'images/header_random_04.jpg' theImages1[4] = 'images/header_random_05.jpg' var j = 0 var p = theImages1.length; var preBuffer = new Array() for (i = 0; i < p; i++){ preBuffer[i] = new Image() preBuffer[i].src = theImages1[i] } var whichImage = Math.round(Math.random()*(p-1)); function showImage(){ document.write(''); }