function setOpacity(obj, opacity) {
  opacity = (opacity == 100)?99.999:opacity;
  // IE/Win
  obj.style.filter = "alpha(opacity:"+opacity+")";
  // Safari<1.2, Konqueror
  obj.style.KHTMLOpacity = opacity/100;
  // Older Mozilla and Firefox
  obj.style.MozOpacity = opacity/100;
  // Safari 1.2, newer Firefox and Mozilla, CSS3
  obj.style.opacity = opacity/100;
}

function swapimage() {

	var bigimage = document.getElementById("bigimage");
	var one = document.getElementById("one");
	var two = document.getElementById("two");
	var three = document.getElementById("three");

	var oneImg = one.childNodes[0];
	var twoImg = two.childNodes[0];
	var threeImg = three.childNodes[0];
	setOpacity(oneImg,40);
	
	image1 = new Image();
	image1.src = "02.jpg";

	image2 = new Image();
	image2.src = "03.jpg";

	one.href = "#";
	one.onclick = function() {
		bigimage.src = "01.jpg";
		setOpacity(oneImg,40);
		setOpacity(twoImg,100);
		setOpacity(threeImg,100);
	}
	
	two.href = "#";
	two.onclick = function() {
		bigimage.src = "02.jpg";
		setOpacity(oneImg,100);
		setOpacity(twoImg,40);
		setOpacity(threeImg,100);
	}
	
	three.href = "#";
	three.onclick = function() {
		bigimage.src = "03.jpg";
		setOpacity(oneImg,100);
		setOpacity(twoImg,100);
		setOpacity(threeImg,40);
	}
	return false;

}

window.onload = swapimage;