function swap(n)
{
if( n == 0 )document.images.aboutroll.src = "images/abt.jpg";
if( n == 1 )document.images.aboutroll.src = "images/abthover.jpg";
if( n == 2 )document.images.servroll.src = "images/serv.jpg";
if( n == 3 )document.images.servroll.src = "images/servhover.jpg";

if( n == 4 )document.images.rsrcroll.src = "images/rsrc.jpg";
if( n == 5 )document.images.rsrcroll.src = "images/rsrchover.jpg";

if( n == 6 )document.images.linksroll.src = "images/linx.jpg";
if( n == 7 )document.images.linksroll.src = "images/linxhover.jpg";



}