function OpenPopupWin(theURL, theWindowName, theWindowFeatures)
{
	var popupWin = window.open(theURL,theWindowName,theWindowFeatures);
}

function OpenPopupWinCentered(theURL, theWindowName, theWindowFeatures, theWindowWidth, theWindowHeight)
{
    var myLeft = (screen.width-theWindowWidth)/2;
    var myTop = (screen.height-theWindowHeight)/2;
    theWindowFeatures+=(theWindowFeatures!='')?',':'';
    theWindowFeatures+=',left='+myLeft+',top='+myTop;
	var popupWin = window.open(theURL,theWindowName,theWindowFeatures+((theWindowFeatures!='')?',':'')+'width='+theWindowWidth+',height='+theWindowHeight);
	popupWin.focus();
}

function OpenGuestbookWin(theURL, theWindowName, theWindowFeatures, theWindowWidth, theWindowHeight, isWindowCentered)
{
  if(window.screen)if(isWindowCentered)if(isWindowCentered=="true"){
    var myLeft = (screen.width-theWindowWidth)/2;
    var myTop = (screen.height-theWindowHeight)/2;
    theWindowFeatures+=(theWindowFeatures!='')?',':'';
    theWindowFeatures+=',left='+myLeft+',top='+myTop;
  }
  window.open(theURL,theWindowName,theWindowFeatures+((theWindowFeatures!='')?',':'')+'width='+theWindowWidth+',height='+theWindowHeight);
}