var homeImage = new Array;
homeImage[0] = "../../image.aspx?ref=8501"; 
homeImage[1] = "../../image.aspx?ref=10019";
homeImage[2] = "../../image.aspx?ref=9358";
homeImage[3] = "../../image.aspx?ref=9761"; 

function homeRefresh (){
var homeChoice = Math.floor(Math.random() * homeImage.length);
document.getElementById("homeRefresh").src = homeImage[homeChoice];
}