function ValidateRegistrationForm(firstName,lastName,emailAddress,password)
{
    if (firstName == "") {
        $('.registerMessage').text("Please enter first name!");
        alert("Please enter first name!");
        return false;
    }
    else if (lastName == "") {
        $('#.registerMessage').text("Please enter surname!");
        alert("Please enter surname!");
        return false;                
    }
    else if (emailAddress == "") {
        $('#.registerMessage').text("Please enter email address!");
        alert("Please enter email address!");
        return false;
    }
    else if (password == "") {
        $('#.registerMessage').text("Please enter password!");        
        alert("Please enter password!");
        return false;
    }
    else if (password.length < 4 || password.length > 15) {
        $('#.registerMessage').text("Password must be between 4 and 15 letters long!");
        alert("Password must be between 4 and 15 letters long!");
        return false;
    }
}