var chosenImage=new Array();
chosenImage[0]="medievalwedding.jpg";
chosenImage[1]="iranianwoman.jpg";
chosenImage[2]="peruwoman.jpg";

var chosenAltCopy=new Array();
chosenAltCopy[0]="A medieval wedding";
chosenAltCopy[1]="Iranian woman";
chosenAltCopy[2]="Peru woman";

var getRan=Math.floor(Math.random()*chosenImage.length);

function randomImage()
{
document.getElementById('randomImage').setAttribute('src','random-images/'+chosenImage[getRan]);
document.getElementById('randomImage').setAttribute('alt',chosenAltCopy[getRan]);
}