var rand1 = 0;
var useRand = 0;

images = new Array;
images[1] = new Image();
images[1].src = "/images/models/girls1.jpg";
images[2] = new Image();
images[2].src = "/images/models/model001.jpg";
images[3] = new Image();
images[3].src = "/images/models/model002.jpg";
images[4] = new Image();
images[4].src = "/images/models/model003.jpg";

function swapPic() 
{
    var imgnum = images.length - 1;
    
    do {
    var randnum = Math.random();
    rand1 = Math.round((imgnum - 1) * randnum) + 1;
    } while (rand1 == useRand);

    useRand = rand1;
    elem = document.getElementById("randimg");
    elem.src = images[useRand].src;
}