// check for old browsers
bName = navigator.appName;
bVer = parseInt(navigator.appVersion);
if ((bName == "Netscape" && bVer >= 3) || 
(bName == "Microsoft Internet Explorer" && bVer >= 4)) br = "n3"; 
else br = "n2";

// validation
function isEmail(elm) {
if (br == "n3") {
if (elm.value.indexOf("@") + "" != "-1" &&
elm.value.indexOf(".") + "" != "-1" &&
elm.value != "") 
return true;
else return false;
}
}
function isFilled(elm) {
if (br == "n3") {
if (elm.value == "" ||
elm.value == null) 
return false;
else return true;
}
}
function isReady(form) {
if (br == "n3") {
if (isFilled(form.Fullname) == false) {
alert("Please enter your Full Name.");
form.Fullname.focus();
return false;
}
if (isEmail(form.Email) == false) {
alert(form.Fullname.value + " please enter your Email.");
form.Email.focus();
return false;
}
if (isFilled(form.Telephone_Number) == false) {
alert(form.Fullname.value + " please enter your Telephone Number.");
form.Telephone_Number.focus();
return false;
}
if (isFilled(form.Fullname && form.Email) == true) {
alert("Thank you " + form.Fullname.value + " a Maprac (UK) Ltd representative will contact you shortly.");
return true;
}
}
}