function validate(formCheck) //Function with a parameter representing a form name.
{
    if (formCheck.firstname.value =="")
    {
        alert("Please provide your name:"); 
        formCheck.firstname.focus();
        return false;
    }

    if (formCheck.phone.value =="")
    {
        alert("Please provide your phone number:"); 
        formCheck.phone.focus();
        return false;
    }

    return true;
}