function user_close(){

// die box schliessen (ausblenden)
	
	//alert(document.getElementById('pos_thickbox').style.visibility);
	document.getElementById('userlogin').style.visibility = 'hidden';
	document.getElementById('userlogin').style.display = 'none';	
}

function userform(){

	//alert(document.getElementById('pos_thickbox').style.visibility);
	document.getElementById('userlogin').style.visibility = 'visible';
	document.getElementById('userlogin').style.display = 'block';	
}