if (document.images)
{

	img1on = new Image();
	img1on.src = "img/menu1_on.gif";
	img2on = new Image();
	img2on.src = "img/menu2_on.gif";
	img3on = new Image();
	img3on.src = "img/menu3_on.gif";
	img4on = new Image();
	img4on.src = "img/menu4_on.gif";
	img5on = new Image();
	img5on.src = "img/menu5_on.gif";
	img6on = new Image();
	img6on.src = "img/menu6_on.gif";


	img1off = new Image();
	img1off.src = "img/menu1_off.gif";
	img2off = new Image();
	img2off.src = "img/menu2_off.gif";
	img3off = new Image();
	img3off.src = "img/menu3_off.gif";
	img4off = new Image();
	img4off.src = "img/menu4_off.gif";
	img5off = new Image();
	img5off.src = "img/menu5_off.gif";
	img6off = new Image();
	img6off.src = "img/menu6_off.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");
 	}
 }