function check_form() {
	var er = "";
	
	if (document.contact_form.contact_name.value == "") { er += "Please enter the Name.\n"; }
	if (document.contact_form.email.value == "") { er += "Please enter the Email.\n"; }
	if (document.contact_form.message.value == "") { er += "Please enter the Message.\n"; }
	
	if (er != "") {
		alert(er);
		return false;
	} else {
		return true;
	}
}