var win = null;
 function NewWindow(mypage,myname,w,h,scroll){
 LeftPosition = 20; 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)}