var win = null;
function NewWindow(mypage,myname,w,h,scroll){
LeftPosition = 790-w;
TopPosition = 540-h;
settings =
'height='+h+',width='+w+',top='+TopPosition+',left='+LeftPosition+',scrollbars='+scroll+',resizable'
win = window.open(mypage,myname,settings)
}