if(document.images){
	
var offImgArray = new Array();
	offImgArray["nav1"]=new Image(135,25)
	offImgArray["nav2"]=new Image(135,25)
	offImgArray["nav3"]=new Image(135,25)
	offImgArray["nav4"]=new Image(135,25)
	offImgArray["nav5"]=new Image(135,25)
	offImgArray["nav6"]=new Image(135,25)
	offImgArray["nav7"]=new Image(135,25)
	offImgArray["nav8"]=new Image(135,25)
	offImgArray["nav9"]=new Image(135,25)
	
	offImgArray["nav1"].src="images/nav1.gif"
	offImgArray["nav2"].src="images/nav2.gif"
	offImgArray["nav3"].src="images/nav3.gif"
	offImgArray["nav4"].src="images/nav4.gif"
	offImgArray["nav5"].src="images/nav5.gif"
	offImgArray["nav6"].src="images/nav6.gif"
	offImgArray["nav7"].src="images/nav7.gif"
	offImgArray["nav8"].src="images/nav8.gif"
	offImgArray["nav9"].src="images/nav9.gif"
	
var onImgArray = new Array();
	onImgArray["nav1"]=new Image(135,25)
	onImgArray["nav2"]=new Image(135,25)
	onImgArray["nav3"]=new Image(135,25)
	onImgArray["nav4"]=new Image(135,25)
	onImgArray["nav5"]=new Image(135,25)
	onImgArray["nav6"]=new Image(135,25)
	onImgArray["nav7"]=new Image(135,25)
	onImgArray["nav8"]=new Image(135,25)
	onImgArray["nav9"]=new Image(135,25)
	
	onImgArray["nav1"].src="images/nav1_on.gif"
	onImgArray["nav2"].src="images/nav2_on.gif"
	onImgArray["nav3"].src="images/nav3_on.gif"
	onImgArray["nav4"].src="images/nav4_on.gif"
	onImgArray["nav5"].src="images/nav5_on.gif"
	onImgArray["nav6"].src="images/nav6_on.gif"
	onImgArray["nav7"].src="images/nav7_on.gif"
	onImgArray["nav8"].src="images/nav8_on.gif"
	onImgArray["nav9"].src="images/nav9_on.gif"
}	

function swapOn(imgName) {
	if(document.images) {
		document.images[imgName].src=onImgArray[imgName].src
		}
}
function swapOff(imgName) {
	if (document.images) {
		document.images[imgName].src=offImgArray[imgName].src
		}
}