function showpic() {
var theImages = new Array()
theImages[0] = '/idximgs/navpicNoShade-01.jpg'
theImages[1] = '/idximgs/navpicNoShade-02.jpg'
theImages[2] = '/idximgs/navpicNoShade-03.jpg'
theImages[3] = '/idximgs/navpicNoShade-04.jpg'
theImages[4] = '/idximgs/navpicNoShade-05.jpg'
theImages[5] = '/idximgs/navpicNoShade-06.jpg'
theImages[6] = '/idximgs/navpicNoShade-07.jpg'
theImages[7] = '/idximgs/navpicNoShade-08.jpg'
theImages[8] = '/idximgs/navpicNoShade-09.jpg'
theImages[9] = '/idximgs/navpicNoShade-10.jpg'
theImages[10] = '/idximgs/navpicNoShade-11.jpg'
theImages[11] = '/idximgs/navpicNoShade-12.jpg'
theImages[12] = '/idximgs/navpicNoShade-13.jpg'
theImages[13] = '/idximgs/navpicNoShade-14.jpg'
theImages[14] = '/idximgs/navpicNoShade-15.jpg'
theImages[15] = '/idximgs/navpicNoShade-16.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));
document.write('<img src="'+theImages[whichImage]+'" />');
}