var numVols = 3;
var selectedVol;

function toggleVols(idName,targetID) {
if (document.getElementById) {
		var list = document.getElementById(idName+targetID);
		selectedVol = list;
		for (var i=1;i<numVols+1;i++) {
			document.getElementById(idName+i).style.display = 'none';	
		}
		selectedVol.style.display = 'block';
	}
}
function setVolDisplay() {
	for (var i=1;i<numVols+1;i++) {
			if (i == currVol) {
				document.getElementById('index_vol'+i).style.display = 'block';	
				document.getElementById('lib_vol'+i).style.display = 'block';	
			}
			else {
				document.getElementById('index_vol'+i).style.display = 'none';
				document.getElementById('lib_vol'+i).style.display = 'none';	
			}
		}
}
window.onload = setVolDisplay;