function el(id){
	return document.getElementById(id);
}
function toggleVis(id, visibility){
	if(visibility == 'visible'){
		el(id).style.display = 'block';
		el(id).style.visibility = 'visible';
	}else if(visibility == 'hidden'){
		el(id).style.display = 'none';
		el(id).style.visibility = 'hidden';
	}else{
		if(el(id).style.visibility == 'visible'){
			el(id).style.display = 'none';
			el(id).style.visibility = 'hidden';
		}else if(el(id).style.visibility == 'hidden'){
			el(id).style.display = 'block';
			el(id).style.visibility = 'visible';
		}
	}
	return true;
}