var ajaxReq;
var colValsArray;

function showHideChild(idNum){
	var divRef = document.getElementById(idNum + "Child");
	divRef.style.display = (divRef.style.display == "none") ? "block" : "none";
}

function openMenu(){
	var thisURL = window.location.href+"&";
	if (thisURL.indexOf("&id=") > -1){
		var itemID = thisURL.substr(thisURL.indexOf("&id=") + 4);
		itemID = itemID.substr(0, itemID.indexOf("&"));
		itemID = itemID.split(".");
		var thisLevel = ""
		var idLen = itemID.length;
		for (var i = 0; i < idLen - 1; i++){
			thisLevel = thisLevel + ((thisLevel == "") ? "" : ".") + itemID[i];
			document.getElementById(thisLevel + "Child").style.display="block";
		}
	}
}

function resizeMenu(adjustAmt) {
	document.getElementById("dynamicMenu").style.height = getInnerWindowSize()[1] - adjustAmt;
}

function getInnerWindowSize() {
	// THIS BIT DETECTS THE AVAILABLE SCREEN SPACE
	// IT ORIGINATES FROM http://www.quirksmode.org/viewport/compatibility.html
	var x,y;
	if (self.innerHeight) {
		x = self.innerWidth;
		y = self.innerHeight;
	} else if (document.documentElement && document.documentElement.clientHeight) {
		x = document.documentElement.clientWidth;
		y = document.documentElement.clientHeight;
	} else if (document.body) {
		x = document.body.clientWidth;
		y = document.body.clientHeight;
	}
	return [x, y];
}

function createAJAXRequest(retrievalURL, responseFunction) {
	if (window.ActiveXObject) {
		ajaxReq = new ActiveXObject("Microsoft.XMLHTTP");
	} else if (window.XMLHttpRequest) {
		ajaxReq = new XMLHttpRequest();
	}
	ajaxReq.open("GET", retrievalURL);
	ajaxReq.onreadystatechange = eval(responseFunction);
	ajaxReq.send(null);
}

function processNewReturnValue() {
	// called by the XMLHTTP onreadystatechange event
	if (ajaxReq.readyState == 4){
		if (ajaxReq.status == 200) {
			// alert(ajaxReq.responseText);
			//document.forms[0].tempText.value = ajaxReq.responseText;		
			buildDHTMLMenu(ajaxReq.responseXML);
		}
	}
}

function buildDHTMLMenu(coreXML){
	var items = coreXML.getElementsByTagName("viewentry");
	var itemLevel;
	var itemPos;
	var outputHTML = "";
	var prevLevel = 1;
	var nextItemLevel;
	outputHTML += "<div id='0' class='menuLink1'><a href='" + webDbName + "/Home?open'>Home</a></div>"
	for (var i = 0; i < items.length; i++){
		itemPos = items[i].getAttribute("position");
		if (items[i + 1]){
			nextItemLevel = items[i + 1].getAttribute("position").split(".").length;
		}		
		itemLevel = itemPos.split(".").length;
		if (itemLevel == prevLevel - 1){
			outputHTML += "</div>";		
		} else if (itemLevel == prevLevel-2){
			outputHTML += "</div></div>";		
		}
		colVals = getViewRowValues(items[i]);
		if (itemLevel == 1){
			if (itemLevel == prevLevel || (itemLevel == 1 && prevLevel == 2)){
				outputHTML += "</div>";
			}
			outputHTML += "<div id='" + itemPos + "' class='menuLink" + itemLevel + "' onClick='showHideChild(&quot;" + itemPos + "&quot;);'>" + colVals[colVals.length-1] + "</div>";
			outputHTML += "<div id='" + itemPos + "Child' style='display:none;'>";
		} else if (itemLevel == 2){
			if ((itemLevel == 1 && prevLevel == 2)){
				outputHTML += "</div>";
			}
			if ((prevLevel == 1 || prevLevel == 2) && (nextItemLevel == 2 || nextItemLevel == 1)){
				outputHTML += "<div id='" + itemPos + "' class='menuLink" + itemLevel + "'><a href='" + webDbName + "/0/" + items[i].getAttribute("unid") + "?open&id=" + itemPos + "'>" + colVals[colVals.length-1] + "</a></div>";
			} else {
				outputHTML += "<div id='" + itemPos + "' class='menuLink" + itemLevel + "' onClick='showHideChild(&quot;" + itemPos + "&quot;);'>" + colVals[colVals.length-1] + "</div>";
				outputHTML += "<div id='" + itemPos + "Child' style='display:none;'>";
			}
		} else {
			outputHTML += "<div id='" + itemPos + "' class='menuLink" + itemLevel + "'><a href='" + webDbName + "/0/" + items[i].getAttribute("unid") + "?open&id=" + itemPos + "'>" + getViewRowValues(items[i])[1] + "</a></div>";
		}
		prevLevel = itemLevel;
	}
	document.getElementById("dynamicMenu").innerHTML = outputHTML;
	openMenu();
}

function getViewRowValues(row) {
	colValsArray = new Array();
	getColumnValues(row);
	return colValsArray;
}

function getColumnValues(rowOrCol){
	var node = rowOrCol.firstChild;
	while (node != null){
		if ((node.nodeType == 3 || node.nodeType == 4) && node.nodeValue != "\n") {
			colValsArray[colValsArray.length] = node.nodeValue;
		} else if (node.nodeType == 1) {
			getColumnValues(node);
		}
		node = node.nextSibling;
	}
}