function formValidate ( form )
{
  if (form.name.value == "") {
    alert( "Please enter your name." );
    form.name.focus();
    return false ;
  }
  if (form.email.value == "") {
    alert( "Please enter the contact email address." );
    form.email.focus();
    return false ;
  }  
  if (form.email.value != "") {
	str = form.email.value	
	if ((str.indexOf('@') < 0) || ((str.charAt(str.length-4) != '.') && (str.charAt(str.length-3) != '.'))){
		alert("Please enter a valid email address.");
		form.email.select();
		return false ;
	}
  }
  if (form.message.value == "") {
    alert( "Please enter your comment." );
    form.message.focus();
    return false ;
  }     
  return true ;
}