// open window
function openWin(url, name, width, height, options) 
{
  var winUrl     = url;
  var winName    = (name) ? name : 'd3';
  var winWidth   = (width) ? width : 600;
  var winHeight  = (height) ? height : 500;     
  var winOptions = (options) ? options : 'resizable,scrollbars';
  var winLeft    = (screen.width-winWidth) / 2;
  var winTop     = (screen.height-winHeight) / 2 - 50;
  var win        = window.open(winUrl,winName,'width='+winWidth+',height='+winHeight+',left='+winLeft+',top='+winTop+','+winOptions);
  win.focus();
}