var theImages = new Array() 

theImages[0] = '_graphics/masthead_graphic1.jpg'
theImages[1] = '_graphics/masthead_graphic2.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]+'" alt="Christ The King, P.C.A.">');
}