function showSection(sec) {
var el = document.getElementById("hide"+sec);
el.className = "show";
el = document.getElementById("section"+sec);
el.className = "show";
el = document.getElementById("view"+sec);
el.className = "hide";
}
function hideSection(sec) {
var el = document.getElementById("hide"+sec);
el.className = "hide";
el = document.getElementById("section"+sec);
el.className = "hide";
el = document.getElementById("view"+sec);
el.className = "show";
}
        function validateVin(){
            var check = document.vinForm.vin.value;
    
         //if empty, alert
            if (! document.vinForm.vin.value){
                    alert ('Please enter a VIN.');
                    return false;
            }else{
                    for (var i = 0; i < check.length; i++) {
                      if (check.length < 17){
                            alert ('Please enter a valid 17 character VIN.');
                            return false;
                      }
                    }
            return true;
            }
        }