var imgs = new Array()


imgs[0] = 'img/geothermal.jpg'
imgs[1] = 'img/solarpanels.jpg'
imgs[2] = 'img/solarpanels.jpg'
imgs[3] = 'img/windfarm.jpg'
imgs[4] = 'img/windfarm2.jpg'
imgs[5] = 'img/windmill.jpg'
imgs[6] = 'img/biomass.jpg'
imgs[7] = 'img/sunset.jpg'
imgs[8] = 'img/sugarcane.jpg'
imgs[9] = 'img/tree1.jpg'
imgs[10] = 'img/tree2.jpg'

var j = 0
var p = imgs.length;
var preBuffer = new Array()
for (i = 0; i < p; i++){
   preBuffer[i] = new Image()
   preBuffer[i].src = imgs[i]
}
var random = Math.round(Math.random()*(p-1));
function showImage(){
document.write('<img src="'+imgs[random]+'">');
}