var Size1X = 375;
var Size1Y = 281;

var Size2X = 280;
var Size2Y = 400;

var Size3X = 600;
var Size3Y = 405;

var Size4X = 100;
var Size4Y = 100;

var NewWindow = 0;

function ShowNewWindow(PageName, SizeNr){
  var SizeStr = '';
  var ParamStr = '';
  var AttribStr = '';
  
switch(SizeNr){
  case '0':
    break;
  case '1':
    SizeStr = ', height='+Size1Y+', width='+Size1X;
    break;
  case '2':
    SizeStr = ', height='+Size2Y+', width='+Size2X;
    break;
  case '3':
    SizeStr = ', height='+Size3Y+', width='+Size3X;
    break;
  case '4':
    SizeStr = ', height='+Size4Y+', width='+Size4X;
    break;				
}
if (NewWindow){
  if (!NewWindow.closed){
    NewWindow.close();
  }
} 
  AttribStr = 'toolbar=no, location=no, directories=no, status=no, menubar=no, scrollbars=no, resizable=no'; 
  ParamStr += AttribStr;
  ParamStr += SizeStr;
  NewWindow = window.open(PageName, "_blank", ParamStr);
  NewWindow.focus();
}