function checkFields()
 {
missinginfo = "";

 if (document.Form.txtName.value == "") 
 {
   missinginfo += "\n - Name ";
 }  
 if (document.Form.txtSubject.value == "") 
 {
   missinginfo += "\n - Subject ";
 }  
 if (document.Form.txtComplaint.value == "") 
 {
   missinginfo += "\n - Complaint ";
 }  
  if (document.Form.txtEmail.value == "") 
 {
   missinginfo += "\n - email ";
 }  

 if (document.Form.txtEmail.value != "") { 
   if(document.Form.txtEmail.value.indexOf('@') == -1 || 
      document.Form.txtEmail.value.indexOf('.') == -1) {
    missinginfo += "You failed to correctly fill your email address :\n";
    }
 }

   
if (missinginfo != "") {
missinginfo =missinginfo +
             "\n________________________________" +
             "\nPlease re-enter and submit again!";
alert(missinginfo);

return false;
}
else return true;
}