// JavaScript Document
function validEmail(email)
{
  var filter = /^([A-Za-z0-9_\-\.])+\@([A-Za-z0-9_\-\.])+\.([A-Za-z]{2,4})$/;
  
  if(filter.test(email) == false) {
    alert("Please enter a valid email address");
  }
  
  return filter.test(email);
}

function Advertisement()
{ 
  var arraylen;

    arraylen = ads_right.length;

  var randomnumber=Math.floor(Math.random()*arraylen);
    document.getElementById("advertisement_wide").innerHTML = ads_right[randomnumber];

}