function validate_form (form)
{	
	var name = form.name.value;
	var telephone = form.telephone.value;
	var email = form.email.value;

    if ( name == "" )
    {
        alert ( "Please fill in your name." );
    }

    else if ( telephone == "" )
    {
        alert ( "Please fill in your telephone number." );
    }
    
	else if ( email == "" )
    {
        alert ( "Please fill in your email address." );
    }
    
	else{
		document.mpls.submit();
		}
}