function togglevis(btn,show,x) {	
	var img = document.getElementById(btn+'i')
	if (show==1) {	
		if (x) {
			for (var i = 1; i <= x; i++) if(document.getElementById(btn+i)) document.getElementById(btn+i).style.display='block'
		} else {
			if (document.getElementById(btn+'c')) document.getElementById(btn+'c').style.display='block'
		}
		img.src = 'images/arrowd.gif'
	}
	else {
		if (x) {
			for (var i = 1; i <= x; i++) if(document.getElementById(btn+i)) document.getElementById(btn+i).style.display='none'
		} else {
			if (document.getElementById(btn+'c')) document.getElementById(btn+'c').style.display='none'
		}
		img.src = 'images/arrowr.gif'
	}
};