var win = null;
function PnWindow(PnUrl,WinName,w,h,scroll,extras){
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+','+extras+',resizable'
win = window.open(PnUrl,WinName,settings);
}