var imgLoad = new Image; 
imgLoad.src = '/lib/yhst-20906297561931/gift-certificate-rear.jpg';
var altimg = '/lib/yhst-20906297561931/gift-certificate-rear.jpg';
var gwimg = '/lib/yhst-20906297561931/gift-certificate-gift-wrap.jpg';
function changeView(tag){
    var link = document.getElementById("gclinks").getElementsByTagName("a");
    var imgcont = document.getElementById("gccont");
    for(var i=0; i<link.length; i++){ link[i].className = ""; }   
    switch(tag){
        case "front":
        imgcont.innerHTML = "";
        imgcont.innerHTML += "<img src='" + imgsrc + "' />";
        link[0].className = "over";
        break;
        case "back":
        imgcont.innerHTML = "";
        imgcont.innerHTML += "<img src='" + altimg + "' />";
        link[1].className = "over";
        break;
        case "gift":
        imgcont.innerHTML = "";
        imgcont.innerHTML += "<img src='" + gwimg + "' />";
        link[2].className = "over";
        break;
        default: break;
    }
}