//afbeeldingen preloaden
bar = new Image();
bar.src = "/img/bar.png";

fill_main = new Image();
fill_main.src = "/img/fill_main.jpg";

shortcuts = new Image();
shortcuts.src = "/img/shortcuts.png";

submenuitem = new Image();
submenuitem.src = "/img/submenuitem.png";

menuitem = new Image();
menuitem.src = "/img/menuitem.png";

menubottom = new Image();
menubottom.src = "/img/menubottom.jpg";

bottommenu = new Image();
bottommenu.src = "/img/bottommenu.jpg";

function toggle(sub_id)	{
	var leftmenu = document.getElementById('leftmenu');
	var allmenus = leftmenu.getElementsByTagName("ul");
	for(var i = 0; i < allmenus.length; i ++) {
		var submenus = allmenus[i].getElementsByTagName("ul");
		for(var j = 0; j < submenus.length; j ++) {
			submenus[j].style.display = "none";
		}
	}
	var submenu = document.getElementById('sub_' + sub_id);
	submenu.style.display = "block";
}

function changeBack(page) {
	if (page == 'algemeen' || page =='0') {
		algemeen = new Image();
		algemeen.src = "/img/bg_algemeen.jpg";
		document.body.style.backgroundImage = 'url(/img/bg_algemeen.jpg)';
		
		if (page == "0") {
			algemeen2 = new Image();
			algemeen2.src = "/img/animaties/algemeen_home.jpg";
			document.getElementById('header_home').style.backgroundImage = 'url(/img/animaties/algemeen_home.jpg)';
		}
	}
	
	else if (page == 'onderwijs' || page =='1') {
		onderwijs = new Image();
		onderwijs.src = "/img/bg_project.jpg";
		document.body.style.backgroundImage = 'url(/img/bg_project.jpg)';
		
		if (page == "1") {
			onderwijs2 = new Image();
			onderwijs2.src = "/img/animaties/onderwijs_home.jpg";
			document.getElementById('header_home').style.backgroundImage = 'url(/img/animaties/onderwijs_home.jpg)';
		}
	}
	
	else if (page == 'muziek' || page =='2') {
		muziek = new Image();
		muziek.src = "/img/bg_muziek.jpg";
		document.body.style.backgroundImage = 'url(/img/bg_muziek.jpg)';
		
		if (page == "2") {
			muziek2 = new Image();
			muziek2.src = "/img/animaties/muziek_home.jpg";
			document.getElementById('header_home').style.backgroundImage = 'url(/img/animaties/muziek_home.jpg)';
		}
	}
	
	else if (page == 'dans' || page =='3') {
		dans = new Image();
		dans.src = "/img/bg_dans.jpg";
		document.body.style.backgroundImage = 'url(/img/bg_dans.jpg)';
		
		if (page == "3") {
			dans2 = new Image();
			dans2.src = "/img/animaties/dans_home.jpg";
			document.getElementById('header_home').style.backgroundImage = 'url(/img/animaties/dans_home.jpg)';
		}
	}
	
	else if (page == 'theater' || page =='4') {
		theater = new Image();
		theater.src = "/img/bg_theater.jpg";
		document.body.style.backgroundImage = 'url(/img/bg_theater.jpg)';
		
		if (page == "4") {
			theater2 = new Image();
			theater2.src = "/img/animaties/theater_home.jpg";
			document.getElementById('header_home').style.backgroundImage = 'url(/img/animaties/theater_home.jpg)';
		}
	}
	
	else if (page == 'kunst' || page =='5') {
		kunst = new Image();
		kunst.src = "/img/bg_kunst.jpg";
		document.body.style.backgroundImage = 'url(/img/bg_kunst.jpg)';
		
		if (page == "5") {
			kunst2 = new Image();
			kunst2.src = "/img/animaties/beeldend_home.jpg";
			document.getElementById('header_home').style.backgroundImage = 'url(/img/animaties/beeldend_home.jpg)';
		}
	}
	
	else if (page == 'workshops'  || page =='6') {
		workshops = new Image();
		workshops.src = "/img/bg_workshops.jpg";
		document.body.style.backgroundImage = 'url(/img/bg_workshops.jpg)';
		
		if (page == "6") {
			workshops2 = new Image();
			workshops2.src = "/img/animaties/workshops_home.jpg";
			document.getElementById('header_home').style.backgroundImage = 'url(/img/animaties/workshops_home.jpg)';
		}
	}
	
	else if (page == 'literair') {
		literair = new Image();
		literair.src = "/img/bg_literatuur.jpg";
		document.body.style.backgroundImage = 'url(/img/bg_literatuur.jpg)';
	}
}

// Open External Links as Blank Targets via Unobtrusive JavaScript
// http://perishablepress.com/press/2007/11/20/open-external-links-as-blank-targets-via-unobtrusive-javascript/

function externalLinks() {
	if (!document.getElementsByTagName) return;
	var anchors = document.getElementsByTagName("a");
	for (var i=0; i<anchors.length; i++) {
		var anchor = anchors[i];
		if (
			anchor.getAttribute("href") && ( 
			anchor.getAttribute("rel") == "external" || 
			anchor.getAttribute("rel") == "external nofollow" || 
			anchor.getAttribute("rel") == "nofollow external" )
			)
		anchor.target = "_blank";
	}
}
window.onload = function() {
	externalLinks();
}

function toggle(id){
	var elm = document.getElementById(id);
		elm.style.display = (elm.style.display=='none'?'block':'none'); 
}