function open_close_contact() {
	if (document.getElementById('contact_div').style.display == 'none' || document.getElementById('contact_div').style.display == '') 				
		document.getElementById('contact_div').style.display = 'block';					
	else 
		document.getElementById('contact_div').style.display = 'none';
}

function open_close_tipafriend() {
	if (document.getElementById('tip_friend').style.display == 'none' || document.getElementById('tip_friend').style.display == '') 				
		document.getElementById('tip_friend').style.display = 'block';					
	else 
		document.getElementById('tip_friend').style.display = 'none';				
}