function hidediv(id) {
	//safe function to hide an element with a specified id
	if (document.getElementById) { // DOM3 = IE5, NS6
		document.getElementById(id).style.display = 'none';
	}
	else {
		if (document.layers) { // Netscape 4
			document.id.display = 'none';
		}
		else { // IE 4
			document.all.id.style.display = 'none';
		}
	}
}

function showdiv(id) {
	//safe function to show an element with a specified id
	for (var i=0;i<ids.length;i++){
	    if(ids[i] != id)
		    hidediv(ids[i]);
	}
	if (document.getElementById) { // DOM3 = IE5, NS6
	    if (document.getElementById(id).style.display == 'block')
	        document.getElementById(id).style.display = 'none'
	    else
		    document.getElementById(id).style.display = 'block';
	}
	else {
		if (document.layers) { // Netscape 4
		    if(document.id.display == 'block')
		        document.id.display = 'none'
		    else
			    document.id.display = 'block';
		}
		else { // IE 4
		    if(document.all.id.style.display == 'block')
		        document.all.id.style.display = 'none'
		    else
			    document.all.id.style.display = 'block';
		}
	}
}