var images = new Array();
var caption = new Array();

images[0] = "images/bj_cover.jpg";
images[1] = "images/jpca_cover.jpg";

caption[0] = "Dr. Wadkins";
caption[1] = "Dr. Tschumper";

function ShowImg() {
var number = images.length;
increment = Math.floor(Math.random() * number);
var strTemp ='<img src="' + images[increment] + '" alt="' + caption[increment] +'">';
document.write(strTemp);
}

var rotate = 5000; 
var count = 0;

function RotateImg(myImage){
 myImage.src=images[count];
 count++;
 if(count==images.length){count = 0;}
 setTimeout("RotateImg(myImage)",rotate);
}