var browserType;

if (document.layers) {browserType = "nn4"}
if (document.all) {browserType = "ie"}
if (window.navigator.userAgent.toLowerCase().match("gecko")) {
 browserType= "gecko"
}
lastid1 = new Array();
maxid1 = new Array();

var lastid= 0
function nextgastimg() {
		if (browserType == "gecko")
			document.poppedLayer = 	eval('document.getElementById("bigimg" + lastid)');
		else if (browserType == "ie")
			document.poppedLayer = eval('document.getElementById("bigimg" + lastid)');
		else
			document.poppedLayer = eval('document.layers["bigimg" + lastid]');
		  document.poppedLayer.style.display = "none";
		lastid += 1;
		if(lastid >= maxid){
			lastid= 0;
		}
		if (browserType == "gecko")
			document.poppedLayer = 	eval('document.getElementById("bigimg" + lastid)');
		else if (browserType == "ie")
			document.poppedLayer = eval('document.getElementById("bigimg" + lastid)');
		else
			document.poppedLayer = eval('document.layers["bigimg" + lastid]');
		  document.poppedLayer.style.display = "block";
}


function nextbigimg(i,j) {
		if (browserType == "gecko")
			document.poppedLayer = 	eval('document.getElementById(j + "bigimg" + lastid1[j])');
		else if (browserType == "ie")
			document.poppedLayer = eval('document.getElementById(j + "bigimg" + lastid1[j])');
		else
			document.poppedLayer = eval('document.layers[j + "bigimg" + lastid1[j]]');
		document.poppedLayer.style.display = "none";
		lastid1[j] += 1;
		if(lastid1[j] >= maxid1[j]){
			lastid1[j]= 0;
		}
		if (browserType == "gecko")
			document.poppedLayer = 	eval('document.getElementById(j + "bigimg" + lastid1[j])');
		else if (browserType == "ie")
			document.poppedLayer = eval('document.getElementById(j + "bigimg" + lastid1[j])');
		else
			document.poppedLayer = eval('document.layers[j + "bigimg" + lastid1[j]]');
		  document.poppedLayer.style.display = "block";
		  return false;
}