function testFields(){
                if(document.getElementById('txtFName').value == ""){
                                document.getElementById('rfvName').style.visibility = "visible";
                }
                if(document.getElementById('txtLName').value == ""){
                                document.getElementById('rfvLast').style.visibility = "visible";
                }
                if(document.getElementById('txtPhone').value == ""){
                                document.getElementById('revPhone').style.visibility = "visible";
                }
                if(document.getElementById('txtEmail').value == ""){
                                document.getElementById('revEmail').style.visibility = "visible";
                }
}