if (document.images)
	{
			var nav1on = new Image()
			nav1on.src = "images/btn/nav1_ro.gif"
			var nav1off = new Image()
			nav1off.src = "images/btn/nav1.gif"

			var nav2on = new Image()
			nav2on.src = "images/btn/nav2_ro.gif"
			var nav2off = new Image()
			nav2off.src = "images/btn/nav2.gif"

			var nav3on = new Image()
			nav3on.src = "images/btn/nav3_ro.gif"
			var nav3off = new Image()
			nav3off.src = "images/btn/nav3.gif"

			var nav4on = new Image()
			nav4on.src = "images/btn/nav4_ro.gif"
			var nav4off = new Image()
			nav4off.src = "images/btn/nav4.gif"

			var enon = new Image()
			enon.src = "images/btn/enbtn_ro.gif"
			var enoff = new Image()
			enoff.src = "images/btn/enbtn.gif"

			var jpon = new Image()
			jpon.src = "images/btn/jpbtn_ro.gif"
			var jpoff = new Image()
			jpoff.src = "images/btn/jpbtn.gif"

	}  

function inact(imgName)
{
		if (document.images)
				document[imgName].src = eval(imgName + 'off.src');
}

function act(imgName) 
{
		if (document.images)
				document[imgName].src = eval(imgName + 'on.src');
}