function showmenu(elmnt)
{
	document.getElementById(elmnt).style.visibility="visible" ;
}
function hidemenu(elmnt)
{
	document.getElementById(elmnt).style.visibility="hidden" ;
}

function send_message() {
	var send_form = true ;
	if( document.getElementById('form_name').value == '' ) send_form = false ;
	if( document.getElementById('form_phone').value == '' ) send_form = false ;
	if( document.getElementById('form_text').value == '' ) send_form = false ;
	if( send_form ){
		document.contact_form.submit();
	}
	else {
		alert('Заполните, пожалуйста, все поля формы.');
	}
}