if (document.images){
	img_1_on = new Image();
	img_1_on.src="/css/nav/1_1.gif";
	img_1_off = new Image();
	img_1_off.src="/css/nav/1.gif";

	img_2_on = new Image();
	img_2_on.src="/css/nav/2_1.gif";
	img_2_off = new Image();
	img_2_off.src="/css/nav/2.gif";

	img_3_on = new Image();
	img_3_on.src="/css/nav/3_1.gif";
	img_3_off = new Image();
	img_3_off.src="/css/nav/3.gif";

	img_4_on = new Image();
	img_4_on.src="/css/nav/4_1.gif";
	img_4_off = new Image();
	img_4_off.src="/css/nav/4.gif";

	img_5_on = new Image();
	img_5_on.src="/css/nav/5_1.gif";
	img_5_off = new Image();
	img_5_off.src="/css/nav/5.gif";

	img_6_on = new Image();
	img_6_on.src="/css/nav/6_1.gif";
	img_6_off = new Image();
	img_6_off.src="/css/nav/6.gif";

	img_7_on = new Image();
	img_7_on.src="/css/nav/7_1.gif";
	img_7_off = new Image();
	img_7_off.src="/css/nav/7.gif";
}

function imgOn (imgName){
  if(document.images){
        document[imgName].src=eval(imgName + "_on.src");
        }
}
function imgOff (imgName){
  if(document.images){
        document[imgName].src=eval(imgName +"_off.src");
        }
}