$("document").ready(function()
{
  $("form").submit(function()
  {
    // validate fields
    if($("#name").val().length == 0)
    {
      $("#name").css({"border":"inset 2px #d00", "background-color":"#fcc"});
      alert("Please enter your name");
      return false;
    }
    else $("#name").css({"border":"inset 2px #999", "background-color":"#fff"});
    
    if($("#email").val().length == 0)
    {
      $("#email").css({"border":"inset 2px #d00", "background-color":"#fcc"});
      alert("Please enter your email address");
      return false;
    }
    else
    {
      // make sure email is valid
      var email = $("#email").val();
      var dot = email.lastIndexOf(".");
      var at = email.indexOf("@");
      
      if(dot < 0 || at < 0 || dot < at)
      {
        alert("Please enter a valid email address")
        return false;
      }
      else $("#email").css({"border":"inset 2px #999", "background-color":"#fff"});
    }

    if($("#message").val().length == 0)
    {
      $("#message").css({"border":"inset 2px #d00", "background-color":"#fcc"});
      alert("Please enter your message");
      return false;
    }
    else $("#message").css({"border":"inset 2px #999", "background-color":"#fff"});
    
    return true;
  });
});