function chkform()
{
	var email = document.jnl2_sign_form.email.value;
	pattern = new RegExp( '^([a-zA-Z0-9\-\.\_]+)(\@)([a-zA-Z0-9\-\.]+)([\.])([a-zA-Z]{2,4})$' );
	if ( !pattern.test(email) )
	{
		alert("Gelieve een geldig email adres in te geven.");
		document.jnl2_sign_form.email.focus();
		return false;
	}
	return true;
	}

function send_data( selection )
{
	if (chkform())
	{
  		document.jnl2_sign_form.method = "post";
  		if ( selection == "sign_in" )  
  		{ 
  			document.jnl2_sign_form.action = "http://www.relaxzone.be/newsletter/sign_in.php?do=sign_in&language=dutch&ml_id=00";
  		}
		if ( selection == "sign_out" ) 
		{ 
			document.jnl2_sign_form.action = "http://www.relaxzone.be/newsletter/sign_out.php?do=sign_out&language=dutch&ml_id=00";
		}
		document.jnl2_sign_form.submit();	
	}
}

function show_center (centernr) {
	for (x=1;x<=6;x++) {
		if (x == centernr) {
			document.getElementById('center_' + x).style.display='block';
			document.getElementById('logo_' + x).className='logo_selected';			
		} else {
			document.getElementById('center_' + x).style.display='none';
			document.getElementById('logo_' + x).className='logo';			
		}
	}
}

function show_promotion (centernr) {
	for (x=1;x<=6;x++) {
		if (x == centernr) {
			document.getElementById('promo_' + x).className='logo_selected';			
		} else {
			document.getElementById('promo_' + x).className='logo';			
		}
	}
}