function Validate()
{
  function ValidateEmail(Input)
  {
    var shape = /^([A-Za-z0-9_\-\.])+\@([A-Za-z0-9_\-\.])+\.([A-Za-z]{2,6})$/;
    var address = Input;
    if(shape.test(address) == false) {return false;}
  }

  var valid = true;
  var x = document.getElementById('form');

  if ( x.name.value == "" )
  {
    alert ( "Please enter your name." );
    x.name.focus();
    valid = false;
  }
  else if ( ValidateEmail(x.email.value) == false )
  {
    alert ( "Please enter a vaild email address." );
    x.email.focus();
    valid = false;
  }
  else if ( x.message.value == "" )
  {
    alert ( "Please enter your message." );
    x.message.focus();
    valid = false;
  }

  return valid;
}