var theImages = new Array()

theImages[0] = '../img/bg_head/bg_head_middle_000.jpg'
theImages[1] = '../img/bg_head/bg_head_middle_001.jpg'
theImages[2] = '../img/bg_head/bg_head_middle_002.jpg'
theImages[3] = '../img/bg_head/bg_head_middle_003.jpg'
theImages[4] = '../img/bg_head/bg_head_middle_004.jpg'
theImages[5] = '../img/bg_head/bg_head_middle_005.jpg'
theImages[6] = '../img/bg_head/bg_head_middle_006.jpg'
theImages[7] = '../img/bg_head/bg_head_middle_007.jpg'
theImages[8] = '../img/bg_head/bg_head_middle_008.jpg'
theImages[9] = '../img/bg_head/bg_head_middle_009.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]+'">');
}