img1src = new Image();
img1src.src = "art/rollovers/areas_practice.gif";
img2src = new Image();
img2src.src = "art/rollovers/attorney.gif";
img3src = new Image();
img3src.src = "art/rollovers/contact.gif";
img4src = new Image();
img4src.src = "art/rollovers/home.gif";

function swapImage(id, imgsrc) {
 document.getElementById(id).setAttribute('src', imgsrc);
}

var win = null;
function CenterPop(mypage,myname,w,h,scroll){
LeftPosition = (screen.width) ? (screen.width-w)/2 : 0;
TopPosition = (screen.height) ? (screen.height-h)/2 : 0;
settings =
'height='+h+',width='+w+',top='+TopPosition+',left='+LeftPosition+',scrollbars='+scroll+',resizable'
win = window.open(mypage,myname,settings)
}