function addLoadEvent(func) {
	var oldonload = window.onload;
	if (typeof window.onload != 'function'){
		window.onload = func;
	} else {
		window.onload = function(){
			oldonload();
			func();
		}
	}
}

function checkActiveLinks(base) {
	if(typeof(base) == 'undefined' && typeof(document.path) != 'undefined') base = document.path;

	linksArray = $$('a');

	var url = window.location;

	for(i = 0; i < linksArray.length; ++i ){
		var a = linksArray[i];

		url = new String(window.location);

		var link = a.href
		if(link.substring(link.length-4, link.length) == '.ait') link = link.substring(0, link.length-4)

		if(link == url || (link != base && link != (base + '/') && link == url.substring(0, link.length))) {
			if(link == url || (link + '/') == url || link == (url + '/')) {
				a.className += ' active_exact';
			}
			if(url.length <= link.length || (url.length > link.length && (url.substring(link.length, link.length+1) == '/' || url.substring(link.length, link.length+4) == '.ait'))) {
				a.className += ' active';
			}
		}
	}
}

function positionSubMenus() {
	var menu_items = $$('a[id^=menu_]');
	for(var i = 0; i < menu_items.length; ++i) {
		var menu = menu_items[i];
		var submenu = $('submenu_'+ menu_items[i].id.substring(5));

		if(submenu != null && menu != null) {
			submenu.style.left = menu.offsetLeft + 'px';
			submenu.style.zIndex = 100;
			
			menu.addEvent('mouseover', showSubMenu);
			submenu.addEvent('mouseover', showSubMenu);
			menu.addEvent('mouseout', hideSubMenu);
			submenu.addEvent('mouseout', hideSubMenu);
		}
	}
}

function showSubMenu(e) {
	var submenu = $('submenu_' + getEventId(e));
	if(submenu != null && typeof(submenu) == 'object') {
		submenu.style.display = 'block';

		// save the menu only for ie.. grmbl
		document.last_submenu = submenu;
	}
}

function hideSubMenu(e) {
	var submenu = $('submenu_' + getEventId(e));

	// load the menu only for ie.. grmbl
	if(submenu == null || typeof(submenu) != 'object') {
		submenu = document.last_submenu;
	}

	if(submenu != null && typeof(submenu) == 'object') {
		submenu.style.display = 'none';
	}
}

function getEventId(e) {
	var obj = e.target;
	while(obj.id.substring(0, 5) != 'menu_' && obj.id.substring(0, 8) != 'submenu_') obj = obj.parentNode;

	var offset = 0;
	while((i = obj.id.indexOf('_', offset)) !== -1) offset = i + 1;

	return parseInt(obj.id.substr(offset));
}

function preLoad(images) {
	document.preLoad = new Array();

	if (document.images) {
		for(i = 0; i < images.length; ++i) {
			document.preLoad[i] = new Image();
			document.preLoad[i].src = images[i];
		}
	}
}

function mouseOver(element, image) {
	if(typeof(element.src_out) == 'undefined' || element.src_out == null) {
		element.src_out = element.src;
		if(typeof(image) != 'undefined') {
			element.src = image;
		} else {
			element.src = element.src.substring(0, element.src.length - 4) + '_up' + element.src.substring(element.src.length - 4, element.src.length);
		}
	}
}

function mouseOut(element) {
	if(typeof(element.src_out) != 'undefined' && element.src_out != null) {
		element.src = element.src_out;
		element.src_out = null;
	}
}

function checkVersion() {
	if(BrowserDetect.browser == "Explorer" && BrowserDetect.version <= 6) {
		var old_version = document.createElement('div');
		old_version.setAttribute('id', 'old_version');
		old_version.setAttribute('class', 'old_version');
		old_version.className = 'old_version';
		
		old_version.innerHTML = '<div class="info"></div><span>U maakt gebruik van een verouderde browser. Voor een optimale weergave raden wij u aan uw browser te updaten. <a class=\"icon_firefox\" target="_blank" href="http://www.mozilla.com/firefox"></a><a class=\"icon_ie\" target="_blank" href="http://www.microsoft.com/netherlands/windows/internet-explorer/"></a></span>';
		
		document.body.insertBefore(old_version,document.body.firstChild);
	}
}
addLoadEvent(checkVersion);

var BrowserDetect = {
	init: function () {
		this.browser = this.searchString(this.dataBrowser) || "An unknown browser";
		this.version = this.searchVersion(navigator.userAgent)
		|| this.searchVersion(navigator.appVersion)
		|| "an unknown version";
		this.OS = this.searchString(this.dataOS) || "an unknown OS";
	},
	searchString: function (data) {
		for (var i=0;i<data.length;i++)	{
			var dataString = data[i].string;
			var dataProp = data[i].prop;
			this.versionSearchString = data[i].versionSearch || data[i].identity;
			if (dataString) {
				if (dataString.indexOf(data[i].subString) != -1)
					return data[i].identity;
			}
			else if (dataProp)
				return data[i].identity;
		}
	},
	searchVersion: function (dataString) {
		var index = dataString.indexOf(this.versionSearchString);
		if (index == -1) return;
		return parseFloat(dataString.substring(index+this.versionSearchString.length+1));
	},
	dataBrowser: [
	{
		string: navigator.userAgent,
		subString: "OmniWeb",
		versionSearch: "OmniWeb/",
		identity: "OmniWeb"
	},
	{
		string: navigator.vendor,
		subString: "Apple",
		identity: "Safari"
	},
	{
		prop: window.opera,
		identity: "Opera"
	},
	{
		string: navigator.vendor,
		subString: "iCab",
		identity: "iCab"
	},
	{
		string: navigator.vendor,
		subString: "KDE",
		identity: "Konqueror"
	},
	{
		string: navigator.userAgent,
		subString: "Firefox",
		identity: "Firefox"
	},
	{
		string: navigator.vendor,
		subString: "Camino",
		identity: "Camino"
	},
	{	// for newer Netscapes (6+)
		string: navigator.userAgent,
		subString: "Netscape",
		identity: "Netscape"
	},
	{
		string: navigator.userAgent,
		subString: "MSIE",
		identity: "Explorer",
		versionSearch: "MSIE"
	},
	{
		string: navigator.userAgent,
		subString: "Gecko",
		identity: "Mozilla",
		versionSearch: "rv"
	},
	{ 	// for older Netscapes (4-)
		string: navigator.userAgent,
		subString: "Mozilla",
		identity: "Netscape",
		versionSearch: "Mozilla"
	}
	],
	dataOS : [
	{
		string: navigator.platform,
		subString: "Win",
		identity: "Windows"
	},
	{
		string: navigator.platform,
		subString: "Mac",
		identity: "Mac"
	},
	{
		string: navigator.platform,
		subString: "Linux",
		identity: "Linux"
	}
	]

};
BrowserDetect.init();