if (document.images) {

var nav1 = new Image();
nav1.src = "/common/nav/images/off/photos.gif"
var nav1on = new Image();
nav1on.src = "/common/nav/images/on/photos.gif"

var nav2 = new Image();
nav2.src = "/common/nav/images/off/services.gif"
var nav2on = new Image();
nav2on.src = "/common/nav/images/on/services.gif"

var nav3 = new Image();
nav3.src = "/common/nav/images/off/prices.gif"
var nav3on = new Image();
nav3on.src = "/common/nav/images/on/prices.gif"


var nav4 = new Image();
nav4.src = "/common/nav/images/off/about_joey.gif"
var nav4on = new Image();
nav4on.src = "/common/nav/images/on/about_joey.gif"

var nav5 = new Image();
nav5.src = "/common/nav/images/off/contact.gif"
var nav5on = new Image();
nav5on.src = "/common/nav/images/on/contact.gif"
}

function imgon(name)  {
if (document.images){
document[name].src = eval(name + "on.src");}
}
function imgoff(name)  {
if (document.images){
document[name].src = eval(name + ".src");}
} 


function validate_form() {
  if (document.mail_form.name.value == ""){
  alert('Please Enter Your Name.');
  return false;
  }
  if (check_email(document.mail_form.email.value) == false){
  alert('Your Email address is empty or invalid..?');
  return false;
  }
  if (document.mail_form.message.value == ""){
        alert('You have not written anything yet?');
  return false;
        }
return true;
}
function check_email(address) {
  if ((document.mail_form.email.value == "")
    || (address.indexOf ('@') == -1)
    || (address.indexOf ('.') == -1))
      return false;
}