sfHover = function() {
	var sfEls = document.getElementById("nav").getElementsByTagName("LI");
	for (var i=0; i<sfEls.length; i++) {
		sfEls[i].onmouseover=function() {
			this.className+=" sfhover";
		}
		sfEls[i].onmouseout=function() {
			this.className=this.className.replace(new RegExp(" sfhover\\b"), "");
		}
	}
}

if (window.attachEvent) window.attachEvent("onload", sfHover);


function show(image, thumb) {
      document.getElementById('image1').style.display="none";
      document.getElementById('image2').style.display="none";
      document.getElementById('image3').style.display="none";
      document.getElementById('image4').style.display="none";
      document.getElementById(image).style.display="block";

      document.getElementById('thumb1').style.display="none";
      document.getElementById('thumb2').style.display="none";
      document.getElementById('thumb3').style.display="none";
      document.getElementById('thumb4').style.display="none";
      document.getElementById(thumb).style.display="block";
}


function hide(thumb2) {
     document.getElementById('thumb1_2').style.display="block";
     document.getElementById('thumb2_2').style.display="block";
     document.getElementById('thumb3_2').style.display="block";
     document.getElementById('thumb4_2').style.display="block";

     document.getElementById(thumb2).style.display="none";
}

function caption(caption) {
     document.getElementById('caption1').style.display="none";
     document.getElementById('caption2').style.display="none";
     document.getElementById('caption3').style.display="none";
     document.getElementById('caption4').style.display="none";

      document.getElementById(caption).style.display="block";

}