if (document.images) {
alt1 = new Image();
alt1.src = "images/okl_1.gif";

alt1on = new Image();
alt1on.src = "images/ams_1.gif";

alt2on = new Image();
alt2on.src = "images/lon_1.gif";

alt3on = new Image();
alt3on.src = "images/new_1.gif";

alt4on = new Image();
alt4on.src = "images/okl_1.gif";

alt5on = new Image();
alt5on.src = "images/mia_1.gif";

alt6on = new Image();
alt6on.src = "images/dal_1.gif";

alt7on = new Image();
alt7on.src = "images/memphis_1.jpg";

}
function imageChange(imageID,imageName) 
{
document.images[imageID].src = eval(imageName + ".src");
}