function checkform(){
  if (document.frmcontact.txtName.value.length < 4){
    alert("Please enter a name with at least 4 characters.")
      return false}
  if ((document.frmcontact.txtEmail.value.length < 9) || (document.frmcontact.txtEmail.value.indexOf('@') == -1) || (document.frmcontact.txtEmail.value.indexOf('.') == -1)){
    alert("Please enter a valid email address like you@domain.com")
  return false}
  
   if (document.frmcontact.txtSub.value == ""){
    alert("Please enter your subject.")
  return false}
  
  if (document.frmcontact.txtMessage.value == ""){
    alert("Please enter your message.")
  return false}
  
  if (document.frmcontact.sa.value == ""){
    alert("Please enter the secure word you see above.")
  return false}
}