if (document.images){
	arrowOn=new Image
	arrowOff=new Image
	img1=new Image
	img2=new Image
	img3=new Image
	img4=new Image
	img5=new Image
	img6=new Image
	imgNone=new Image
		
	arrowOn.src="http://bancroft.berkeley.edu/images/arrowgreen.gif"
	arrowOff.src="http://bancroft.berkeley.edu/images/arrow.gif"
	img1.src="http://bancroft.berkeley.edu/images/referencemenu1.gif"
	img2.src="http://bancroft.berkeley.edu/images/referencemenu2.gif"
	img3.src="http://bancroft.berkeley.edu/images/referencemenu3.gif"
	img4.src="http://bancroft.berkeley.edu/images/referencemenu4.gif"
	img5.src="http://bancroft.berkeley.edu/images/referencemenu5.gif"
	img6.src="http://bancroft.berkeley.edu/images/referencemenu6.gif"
	imgNone.src="http://bancroft.berkeley.edu/images/referencemenu0.gif"
	
}

function chgImg(imgField,newImg){
	if (document.images){
		document[imgField].src=eval(newImg+".src")
	}
	
}