// Set up the image files to be used.
// To add more image files, add to the array.
var randomImages = new Array();

randomImages[0] = '/images/Gallery/bluebonnets.jpg';
randomImages[1] = '/images/Gallery/bluff.jpg';
randomImages[2] = '/images/Gallery/cactusflowers.jpg';
randomImages[3] = '/images/Gallery/caterpillar.jpg';
randomImages[4] = '/images/Gallery/flowerfieldyellow.jpg';
randomImages[5] = '/images/Gallery/flowerfieldwhite.jpg';
randomImages[6] = '/images/Gallery/mountains.jpg';
randomImages[7] = '/images/Gallery/newmexico.jpg';
randomImages[8] = '/images/Gallery/westtexas.jpg';
randomImages[9] = '/images/Gallery/bach.jpg';
randomImages[10] = '/images/Gallery/balloon1.jpg';
randomImages[11] = '/images/Gallery/balloon2.jpg';
randomImages[12] = '/images/Gallery/balloon3.jpg';
randomImages[13] = '/images/Gallery/balloon4.jpg';
randomImages[14] = '/images/Gallery/blanco1.jpg';
randomImages[15] = '/images/Gallery/blanco2.jpg';
randomImages[16] = '/images/Gallery/blanco3.jpg';
randomImages[17] = '/images/Gallery/blanco4.jpg';
randomImages[18] = '/images/Gallery/blanco5.jpg';
randomImages[19] = '/images/Gallery/bluff.jpg';
randomImages[20] = '/images/Gallery/butterfly1.jpg';
randomImages[21] = '/images/Gallery/fdsunset1.jpg';
randomImages[22] = '/images/Gallery/fdsunset2.jpg';
randomImages[23] = '/images/Gallery/flowerfieldmixed.jpg';
randomImages[24] = '/images/Gallery/hurst1.jpg';
randomImages[25] = '/images/Gallery/hurst2.jpg';
randomImages[26] = '/images/Gallery/moose.jpg';
randomImages[27] = '/images/Gallery/springlake1.jpg';
randomImages[28] = '/images/Gallery/springlake2.jpg';
randomImages[29] = '/images/Gallery/ssbluff.jpg';
randomImages[30] = '/images/Gallery/ssriver1.jpg';
randomImages[31] = '/images/Gallery/ssriver2.jpg';
randomImages[32] = '/images/Gallery/ssriver3.jpg';
randomImages[33] = '/images/Gallery/ssriver4.jpg';
randomImages[34] = '/images/Gallery/sssunset1.jpg';
randomImages[35] = '/images/Gallery/sssunset2.jpg';
randomImages[36] = '/images/Gallery/sssunset3.jpg';
randomImages[37] = '/images/Gallery/sswaterfall.jpg';
randomImages[38] = '/images/Gallery/turtle.jpg';
randomImages[39] = '/images/Gallery/vegaswater.jpg';
randomImages[40] = '/images/Gallery/windmill.jpg';
randomImages[41] = '/images/Gallery/lbsunset1.jpg';

var j = 0;
var p = randomImages.length;
var preBuffer = new Array();
for (var i = 0; i < p; i++){
  preBuffer[i] = new Image();
  preBuffer[i].src = randomImages[i];
}
var whichImage = Math.round(Math.random()*(p-1));
function showRandomImage(){
  document.images['headerimage'].src = randomImages[whichImage];
}