function validateForm()
{
 var okSoFar=true
 with (document.OF)
 {
  if (firstname.value=="" && okSoFar)
  {
    okSoFar=false
    alert("Please write your name!")
    firstname.focus()
  }
  if (lastname.value=="" && okSoFar)
  {
    okSoFar=false
    alert("Please write your lastname!")
    lastname.focus()
  }
  if (country.value=="" && okSoFar)
  {
    okSoFar=false
    alert("Please write your country of residence!")
    country.focus()
  }
  var foundAt = email.value.indexOf("@",0)
  if (foundAt < 1 && okSoFar)
  {
    okSoFar = false
    alert ("Please write a valid e-mail address")
    email.focus()
  }
  if ((subject.value=="0") && okSoFar)
  {
    okSoFar=false
    alert("Please choose a subject")
    subject.focus()
  }
  if (okSoFar==true)
  {
   submit();
  }
 }
}