<!-- 
if (document.images) {
fence_img1on=new Image();
fence_img1on.src="images/nav_fence/btn1on.gif";
fence_img2on=new Image();
fence_img2on.src="images/nav_fence/btn2on.gif";
fence_img3on=new Image();
fence_img3on.src="images/nav_fence/btn3on.gif";
fence_img4on=new Image();
fence_img4on.src="images/nav_fence/btn4on.gif";

fence_img1off=new Image();
fence_img1off.src="images/nav_fence/btn1off.gif";
fence_img2off=new Image();
fence_img2off.src="images/nav_fence/btn2off.gif";
fence_img3off=new Image();
fence_img3off.src="images/nav_fence/btn3off.gif";
fence_img4off=new Image();
fence_img4off.src="images/nav_fence/btn4off.gif";

}
function fence_imgon(fence_imgName) { if (document.images) { document[fence_imgName].src = eval(fence_imgName + "on.src"); } }
function fence_imgoff(fence_imgName) { if (document.images) { document[fence_imgName].src = eval(fence_imgName + "off.src"); } }
// -->