function show (id, list, host){
	
	if (document.getElementById(id).style.display == 'block')
	{
		document.getElementById(id).style.display = 'none';
		document.getElementById(id).style.visibility = 'hidden';
		list.style.backgroundImage = "url("+host+"images/plus.gif)";
	}
	else
	{
		if (document.getElementById(id).style.display == 'none') {
			document.getElementById(id).style.display = 'block';
			document.getElementById(id).style.visibility = 'visible';
			list.style.backgroundImage = "url("+host+"images/minus.gif)";
		}
		else {			
			document.getElementById(id).style.display = 'none';
			document.getElementById(id).style.visibility = 'hidden';
			list.style.backgroundImage = "url("+host+"images/plus.gif)";
		}
	}
}