var cur_tab = 'details';

function show_tab(name) {
    if (cur_tab) {
        if (cur_tab == name) {
            return;
        }
        document.getElementById(cur_tab + "Heading").className = "";
        document.getElementById(cur_tab + "Text").className = "";
    }
    
    document.getElementById(name + "Heading").className = "focused";
    document.getElementById(name + "Text").className = "focused";
    cur_tab = name;
}


function change_product_image(name, url) {
    var e = document.getElementById('mainProductImage');
    e.src = name;
    
    var e = document.getElementById('mainProductImageLink');
    e.href = url;
}