function loader(navdiv) {
document.getElementById(navdiv).innerHTML = '<img src="/how/images/home_page/ajax-loader.gif" id="navdiv" style="padding-top:100px; padding-left:200px;">';
}

function scroll_loader(navdiv) {
document.getElementById(navdiv).innerHTML = '<img src="/how/images/home_page/ajax-loader.gif" id="navdiv" style="padding-top:100px; padding-left:250px;">';
}