function sendmess()
{
var mess="";
if (document.getElementById('name').value=="") mess+="Please, fill \"Name\" field\n";
if (document.getElementById('email').value=="") mess+="Please, fill \"Email\" field\n";
if (document.getElementById('company').value=="") mess+="Please, fill \"Company\" field\n";
if (document.getElementById('message').value=="") mess+="Please, fill \"Message\" field";
if (mess!="")
{
alert(mess);
}
else
{
document.getElementById('feedback').action="feedback.php";
document.getElementById('feedback').submit();
}
}