a1=new Image()
a1.src="images/nav_who.gif"
a2=new Image()
a2.src="images/nav_who_on.gif"
b1=new Image()
b1.src="images/nav_services.gif"
b2=new Image()
b2.src="images/nav_services_on.gif"
c1=new Image()
c1.src="images/nav_client.gif"
c2=new Image()
c2.src="images/nav_client_on.gif"
d1=new Image()
d1.src="images/nav_person.gif"
d2=new Image()
d2.src="images/nav_person_on.gif"
<!--
function filter(imagename,objectsrc){
if (document.images)
document.images[imagename].src=eval(objectsrc+".src")
}
function select_url(x)	{
location = x;
}