sLeft = window.screenLeft;
sTop = window.screenTop;
var win = null;
function NewWindow(mypage,myname,w,h,scroll) {
   LeftPosition = (document.body.clientWidth) ? (sLeft+((document.body.clientWidth-w)/2)) : 0;
   TopPosition = (document.body.clientHeight) ? (sTop+((document.body.clientHeight-h)/2)) : 0;
   settings = 'height='+h+',width='+w+',top='+TopPosition+',left='+LeftPosition+',scrollbars='+scroll+',resizable'
   win = window.open(mypage,myname,settings)

   if(win.window.focus) {
       win.window.focus();
   }
}