var partnersImg=new Array(new Image(), new Image(), new Image(), new Image())
partnersImg[0].src="images/home_partners2.jpg" 
partnersImg[1].src="images/home_partners3.jpg" 
partnersImg[2].src="images/home_partners4.jpg"
partnersImg[3].src="images/home_partners5.jpg"

var whichNum = Math.round(Math.random() * (partnersImg.length -1));	
var whichpartnersImg = partnersImg[whichNum].src;

document.write("<img src='" + whichpartnersImg + "' alt='Partners: Mortgage Brokers, CPA's, Real Estate Brokers' width='245' height='131'>");