var quizQuestions = [
	"True or false? Using a condom to avoid pregnancy is 100% reliable...",
	"True or false? A woman will always stop having her period the minute she is pregnant...",
	"True or false? Pregnancy counselling is free to women in New Zealand...",
	"True or false? Drinking or doing drugs during pregnancy can harm your baby...",
	"True or false? If a woman chooses adoption she needs to talk to Child Youth and Family...",
	"True or false? Most adoptions today have no contact between birth families and their children..."
];
var quizQuestion = Math.floor(Math.random()*quizQuestions.length);
var quizBox=null;
var opacityMode=null;

function changeQuestion(){
	quizQuestion=(quizQuestion+1)%quizQuestions.length;
	doFade(0, quizQuestions[quizQuestion]);
}

window.init[window.init.length]=function(){
	quizBox = document.getElementById("quizMagicText");
	if(typeof quizBox.style.opacity!="undefined"){
		opacityMode=1;
	}else if(typeof quizBox.style.filter!="undefined"){
		opacityMode=2;
	}
	window.setInterval(changeQuestion, 5000);
	changeQuestion();
};

function doFade(currentOpacity, newText){
	currentOpacity=currentOpacity+0.2;
	if(currentOpacity>=(1*Math.PI)){
		setOpacity(quizBox, 1);
		return;
	}
	var newOpacity=1-Math.sin(currentOpacity);
	if(newOpacity-0.01<0){
		quizBox.innerHTML=newText;
	}
	setOpacity(quizBox, newOpacity);
	window.setTimeout(function(){doFade(currentOpacity, newText);}, 50);
}

function setOpacity(target, opacity){
	switch(opacityMode){
		case 1:
			target.style.opacity=opacity;
			break;
		case 2:
			target.style.filter="Alpha(opacity="+Math.round(opacity*100)+")";
			break;
	}
}