var theSets = new Array();
theSets[0] = 'g_01';
theSets[1] = 'g_02';
theSets[2] = 'g_03';
theSets[3] = 'g_04';
theSets[4] = 'g_05';
theSets[5] = 'g_06';
theSets[6] = 'g_07';
theSets[7] = 'g_08';
theSets[8] = 'g_09';

var s = theSets.length;
var whichNum = Math.round(Math.random()*(s-1));
var whichSet = theSets[whichNum];

var theImage = whichSet+'.jpg';
var preBuffer = new Array();
   preBuffer[0] = new Image();
   preBuffer[0].src = '../ximages/'+theImage;
function showImage(w,h){
   document.write('<img src="../assets/img/random/'+theImage+'" border="0" width="'+w+'"'+' height="'+h+'">');
}