var tabMenu = {
	subContainers:[], lastCurrentTab:null,

	revealSubMenu: function(current) {
		this.hideallsubs()
		
		if (this.lastCurrentTab != null)
			this.lastCurrentTab.className	= '';
		
		if (current.getAttribute("rel"))
			document.getElementById(current.getAttribute("rel")).style.display 	= 'block';
			current.className				= 'current';
			this.lastCurrentTab				= current;
	},

	hideallsubs:function() {
		for (var i=0; i<this.subContainers.length; i++)
			document.getElementById(this.subContainers[i]).style.display	= 'none';
	},

	init:function(selectedIndex){
	var topMenuElement			= 'topMenu';
	
	document.getElementById('subMenu').style.display 	= 'block';
	
	var tabItems				= document.getElementById(topMenuElement).getElementsByTagName("a")
		for (var i=0; i<tabItems.length; i++) {
			if (tabItems[i].getAttribute("rel"))
				this.subContainers[this.subContainers.length]	= tabItems[i].getAttribute("rel")
			if (i == selectedIndex) {
				tabItems[i].className	= 'current';
				this.revealSubMenu(tabItems[i])
			}
			tabItems[i].onmouseover = function() {
				tabMenu.revealSubMenu(this)
			}
		}
	}
}

var xmlHttp;

function createXMLHttpRequest(){
	if(window.ActiveXObject){
		xmlHttp = new ActiveXObject("Microsoft.XMLHTTP");
	}else if(window.XMLHttpRequest){
		xmlHttp = new XMLHttpRequest;
	}		
}

function getWoningCount () {
	var plaats					= document.getElementById('plaats').value;
	var type					= document.getElementById('type').value;
	var prijs					= document.getElementById('prijsklasse').value;
	var koophuur				= document.getElementById('koophuur').value;
	
	createXMLHttpRequest();
	
	var queryString			= "plaats=" + plaats + "&type=" + type + "&prijs=" + prijs + "&koophuur=" + koophuur;
	var url 				= "http://www.agterdenbosch.nl/inc/getWoningCount.php?timestamp=" + new Date().getTime();
	
	xmlHttp.open("POST", url, true);
	xmlHttp.onreadystatechange = callbackWoningCount;
	xmlHttp.setRequestHeader("Content-Type", "application/x-www-form-urlencoded;");
	xmlHttp.send(queryString);	
}

function callbackWoningCount () {
	if(xmlHttp.readyState == 4){
		if(xmlHttp.status == 200){
			document.getElementById('aanbodKnop').value					= xmlHttp.responseText;
		}
	}
}