function showAns(QUES) {
	var ansID = "a" + QUES.id.substr(1, QUES.id.length - 1);
	var ansObj = document.getElementById(ansID);
	if (ansObj) {
		switch (ansObj.style.display) {
			case "none":
				ansObj.style.display = "block";
				QUES.style.backgroundImage = "url(images/arrow.gif)";
				break;
			case "block":
				ansObj.style.display = "none";
				QUES.style.backgroundImage = "url(images/ball.jpg)";
				break;
			default:
				ansObj.style.display = "block";
				QUES.style.backgroundImage = "url(images/arrow.gif)";
				break;
		}	
	}
}