var dYK = new Array() 

dYK[0] = '<span class="facts">You don&#8217;t have to shut off your computer at night to save energy. Putting it to "Sleep" is just as effective - and can cut up to $90 a year in power costs.</span>'

dYK[1] = '<span class="facts">Heating and cooling account for over 50&#37; of the energy use in the average American home.</span>'

dYK[2] = '<span class="facts">An air conditioner operating in the shade uses 10&#37; less electricity than the same one running on the sunny side of a house.</span>'

dYK[3] = '<span class="facts">Compact fluorescent light bulbs (CFLs) use only one-fourth the energy of incandescent bulbs and can cut your lighting costs in half.</span>'

var k = 0
var q = dYK.length;

var preBuffer = new Array()
for (w = 0; w < q; w++){
   preBuffer[w] = new Image()
   preBuffer[w].src = dYK[w]
}

var whichDYK = Math.round(Math.random()*(q-1));
function randomDYK(){
document.write('<span>'+dYK[whichDYK]+'</span>');
}