var theImages = new Array()
theImages[0] = 'http://www.hagerstown.org/images/headers/hdr_01.jpg'
theImages[1] = 'http://www.hagerstown.org/images/headers/hdr_02.jpg'
theImages[2] = 'http://www.hagerstown.org/images/headers/hdr_03.jpg'
theImages[3] = 'http://www.hagerstown.org/images/headers/hdr_04.jpg'
theImages[4] = 'http://www.hagerstown.org/images/headers/hdr_06.jpg'
theImages[5] = 'http://www.hagerstown.org/images/headers/hdr_07.jpg'
theImages[6] = 'http://www.hagerstown.org/images/headers/hdr_08.jpg'
theImages[7] = 'http://www.hagerstown.org/images/headers/hdr_09.jpg'
theImages[8] = 'http://www.hagerstown.org/images/headers/hdr_10.jpg'
theImages[9] = 'http://www.hagerstown.org/images/headers/hdr_11.jpg'

var j = 0
var p = theImages.length;

var preBuffer = new Array()
for (i = 0; i < p; i++){
   preBuffer[i] = new Image()
   preBuffer[i].src = theImages[i]
}

var whichImage = Math.round(Math.random()*(p-1));
function showImage(){
document.write('<img src="'+theImages[whichImage]+'">');
}