function showPage(id) {
   document.getElementById(id).style.visibility="visible";
}

function hideAll() {
   document.getElementById("home_content1").style.visibility="hidden";
   document.getElementById("home_content2").style.visibility="hidden";
   document.getElementById("about_text").style.visibility="hidden";
   document.getElementById("login_text").style.visibility="hidden";
   document.getElementById("testimonials").style.visibility="hidden";
   document.getElementById("blog").style.visibility="hidden";
   document.getElementById("testimonials").style.visibility="hidden";
   document.getElementById("contact_text").style.visibility="hidden";
   document.getElementById("buy1").style.visibility="hidden";
}