function showbox(){	
	
	document.getElementById("mask").style.visibility='visible';
	document.getElementById("massage_box").style.visibility='visible';
}
function closebox(){	
	document.getElementById("massage_box").style.visibility='hidden';
	document.getElementById("mask").style.visibility='hidden';
}
function movebox(){	
	
	document.getElementById('show_box_head').className='move';
}