function show(drop, cls, btn){
	document.getElementById(drop).style.visibility ='visible';
	document.getElementById(btn).className ='active';
}

function hide(drop, btn){
	document.getElementById(drop).style.visibility ='none';
	document.getElementById(btn).className = '';
}

/*function show(drop, cls, btn){
	document.getElementById(drop).style.visibility = 'block';
	document.getElementById(btn).className ='active';
}

function hide(drop, btn){
	document.getElementById(drop).style.visibility = 'none';
	document.getElementById(btn).className = '';
}
*/