function input_check(){

var name = document.form.name.value ;
var email = document.form.email.value ;
var country = document.form.country.value ;
var office = document.form.office.value ;
var tel_office = document.form.tel_office.value ;

var alert_name = "Please enter Your Name." ;
var alert_mail1 = "Please enter E-Mail." ;
var alert_mail2 = "Please enter E-Mail correctly." ;
var alert_country = "Please enter Country." ;
var alert_office = "Please enter Company." ;
var alert_tel_office = "Please enter Tel." ;

if(!Is_Null(name)){alert(alert_name); return false; };
if(!Is_Null(email)){alert(alert_mail1); return false; };
if(!Is_ValidEmail(email)){alert(alert_mail2); return false; };
if(!Is_Null(country)){alert(alert_country); return false; };
if(!Is_Null(office)){alert(alert_office); return false; };
if(!Is_Null(tel_office)){alert(alert_tel_office); return false; };

return true;

}