var iValue, rNumber;

var titleimg1 = new Image();
var titleimg2 = new Image();
var titleimg3 = new Image();
var titleimg4 = new Image();
var titleimg5 = new Image();

titleimg1 = "img/sitetitle_a.jpg";
titleimg2 = "img/sitetitle_b.jpg";
titleimg3 = "img/sitetitle_c.jpg";
titleimg4 = "img/sitetitle_d.jpg";
titleimg5 = "img/sitetitle_e.jpg";

function display_image3(){
iValue3 = Math.random() * 5;
rNumber3 = Math.ceil(iValue3);
if(rNumber3==0) rNumber3++;
document.image3.src=eval("titleimg" + rNumber3);
}