// JavaScript Document
if (document.images) {
btn1 =  new Image
btn2 =  new Image

btn1.src = "images/btn1.gif"
btn2.src =  "images/btn2.gif"
}

function roll(imgField,newImg) {
		if (document.images) {
			document[imgField].src= eval(newImg + ".src")
		}
	}
	// end script for navigation