function popup() {
	if (document.getElementById("popupcont").style.display == "block") {
		document.getElementById("popupcont").style.display = "none";
		document.getElementById("zwart").style.display = "none";
	} else {
		getPageSize();
		document.getElementById("popupcont").style.display = "block";
		document.getElementById("zwart").style.display = "block";
	}
}

function closePopUp() {
	document.getElementById("popupcont").style.display = "none";
	document.getElementById("zwart").style.display = "none";
}

function keuze(media) {
	document.getElementById("hyves").style.backgroundPosition = "0px 0px";
	document.getElementById("twitter").style.backgroundPosition = "0px 0px";
	document.getElementById("facebook").style.backgroundPosition = "0px 0px";
	document.getElementById(media).style.backgroundPosition = "0px -28px";
	document.getElementById("hyves_radio").checked = false;
	document.getElementById("twitter_radio").checked = false;
	document.getElementById("facebook_radio").checked = false;
	document.getElementById(media + "_radio").checked = true;
}

$(document).ready(function() {
      $("#Formulier").validate({
        rules: {
          Voornaam: "required",// simple rule, converted to {required:true}
		  Achternaam: "required",
          email: {// compound rule
            required: true,
            email: true
          },
          voorwaarden: "required",
          socialmedia: "required",
		  nieuwsbrief: "required"
        },
        messages: {
          Voornaam: "Geef een voornaam op",
		  Achternaam: "Geef een achternaam op",
		  email: "Voer een geldig emailadres in",
		  socialmedia: "Kies een social media kanaal",
		  nieuwsbrief: "Maak een keuze voor de nieuwsbrief"
        }
      });
    });



function getPageSize() {
	        
	     var xScroll, yScroll;
		
		if (window.innerHeight && window.scrollMaxY) {	
			xScroll = window.innerWidth + window.scrollMaxX;
			yScroll = window.innerHeight + window.scrollMaxY;
		} else if (document.body.scrollHeight > document.body.offsetHeight){ // all but Explorer Mac
			xScroll = document.body.scrollWidth;
			yScroll = document.body.scrollHeight;
		} else { // Explorer Mac...would also work in Explorer 6 Strict, Mozilla and Safari
			xScroll = document.body.offsetWidth;
			yScroll = document.body.offsetHeight;
		}
		
		var windowWidth, windowHeight;
		
		if (self.innerHeight) {	// all except Explorer
			if(document.documentElement.clientWidth){
				windowWidth = document.documentElement.clientWidth; 
			} else {
				windowWidth = self.innerWidth;
			}
			windowHeight = self.innerHeight;
		} else if (document.documentElement && document.documentElement.clientHeight) { // Explorer 6 Strict Mode
			windowWidth = document.documentElement.clientWidth;
			windowHeight = document.documentElement.clientHeight;
		} else if (document.body) { // other Explorers
			windowWidth = document.body.clientWidth;
			windowHeight = document.body.clientHeight;
		}	
		
		// for small pages with total height less then height of the viewport
		if(yScroll < windowHeight){
			pageHeight = windowHeight;
		} else { 
			pageHeight = yScroll;
		}
	
		// for small pages with total width less then width of the viewport
		if(xScroll < windowWidth){	
			pageWidth = xScroll;		
		} else {
			pageWidth = windowWidth;
		}

		document.getElementById('zwart').style.height = pageHeight + "px";
}