var theSets = new Array();
theSets[0] = 'hp_properties_01';
theSets[1] = 'hp_properties_02';
theSets[2] = 'hp_properties_03';
theSets[3] = 'hp_properties_04';

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/properties/'+theImage;
function showImage(w,h){
   document.write('<img src="ximages/properties/'+theImage+'" border="0" width="'+w+'"'+' height="'+h+'">');
}