var PopWindow;
function Pop(URL,popW,popH) {
	if (! window.focus)return true;

	// http://www.howtocreate.co.uk/tutorials/index.php?tut=0&part=16
	if (self.innerHeight) {
		iWidth = self.innerWidth;
		iHeight = self.innerHeight+160;
    xPos = window.screenX;
    yPos = window.screenY;
	}
	else if (document.documentElement && document.documentElement.clientWidth) {
		iWidth = document.documentElement.clientWidth+20;
		iHeight = document.documentElement.clientHeight+160;
    xPos = window.screenLeft;
    yPos = window.screenTop-110;
	}
	else if (document.body)	{
		iWidth = document.body.clientWidth+20;
		iHeight = document.body.clientHeight+160;
    xPos = window.screenLeft;
    yPos = window.screenTop-110;
	}

	var leftPos = (iWidth-popW)/2 + xPos, topPos = (iHeight-popH)/2 + yPos;
	PopWindow = window.open(URL, 'PopWin', 'resizable,scrollbars,height=' + popH + ',width=' + popW + ',top=' + topPos + ',screenY=' + topPos + ',left=' + leftPos + ',screenX=' + leftPos );
	return false;
}