var regexEmail = /^[\w\-]+(\.[\w\-]+)*@[\w\-]+(\.[\w\-]+)*(\s*,\s*([\w\-]+(\.[\w\-]+)*@[\w\-]+(\.[\w\-]+)*)+)*$/;

function validateform(w) {
    var Company = w.Company.value;
    var Name = w.Name.value;
    var Email = w.Email.value;
    var Phone = w.Phone.value;
    
    var msg = '';
    
    if(Company == '') {
        msg = msg + 'Please enter your Company\n';
    }
    
    if(Name == '') {
        msg = msg + 'Please enter your Name\n';
    }
    
    if(Email == '') {
        msg = msg + 'Please enter your Email Address\n';
    } else {
        //make sure email is valid
        if(!regexEmail.test(Email)) {
            msg = msg + "The Email address doesn't seem to be valid.";
        }
    }
    
    if(Phone == '') {
        msg = msg + 'Please enter your Phone\n';
    }
    
    if(msg == '')
        return true;
    else {
        alert(msg);
        return false;
    }
}