var win = null;
function NewWindow(mypage,myname,h,w,scroll){
if (h==null) h=400;
LeftPosition = (screen.width) ? (screen.width-620)/2 : 0;
TopPosition = (screen.height) ? (screen.height-h)/2 : 0;
settings ='height='+h+',width='+620+',top='+TopPosition+',left='+LeftPosition+',scrollbars='+'yes'
win = window.open(mypage,myname,settings)
}