var popupWindow;
function openPopupWindow(pageUrl, pageWidth, pageHeight, pageScrollbars, pageBrowserControls) {
  if (!popupWindow || popupWindow.closed) {
  } else {
		popupWindow.window.close();
  }
  var showScrollbars = "no";
  if (pageScrollbars) {
  	showScrollbars = "yes";
  }
  var showBrowserControls = "no";
  if (pageBrowserControls) {
  	showBrowserControls = "yes";
  }
	popupWindow = window.open(pageUrl,"Window",'scrollbars='+showScrollbars+',toolbar='+showBrowserControls+',menubar='+showBrowserControls+',status='+showBrowserControls+',resizable='+showBrowserControls+',location='+showBrowserControls+',width='+pageWidth+',height='+pageHeight+',top='+(screen.height-pageHeight)/2+',left='+(screen.width-pageWidth)/2);
	if (!popupWindow) {
		alert("Please enable popups to view the requested window.");
	} else {
		popupWindow.opener = this.window;
		popupWindow.focus();
	}
}