a1=new Image(200,35)
a1.src="buttons/homepage-1.gif"
a2=new Image(200,35)
a2.src="buttons/homepage-2.gif"

b1=new Image(200,35)
b1.src="buttons/news-1.gif"
b2=new Image(200,35)
b2.src="buttons/news-2.gif"

c1=new Image(200,35)
c1.src="buttons/events-1.gif"
c2=new Image(200,35)
c2.src="buttons/events-2.gif"

d1=new Image(200,35)
d1.src="buttons/board-1.gif"
d2=new Image(200,35)
d2.src="buttons/board-2.gif"

e1=new Image(200,35)
e1.src="buttons/membership-1.gif"
e2=new Image(200,35)
e2.src="buttons/membership-2.gif"

f1=new Image(200,35)
f1.src="buttons/fil-am-1.gif"
f2=new Image(200,35)
f2.src="buttons/fil-am-2.gif"

g1=new Image(200,35)
g1.src="buttons/contact-1.gif"
g2=new Image(200,35)
g2.src="buttons/contact-2.gif"

function filter(imagename,objectsrc){
if (document.images)
document.images[imagename].src=eval(objectsrc+".src")
}