/**********************************************************
	Otevření okna s nápovědou 
**********************************************************/
function PopUpHelp(adr)
	{
  	var w 	= 	470;
	var h 	= 	400;
	var t 	= 	(screen.availHeight - h) / 2; 
	var l 	= 	(screen.availWidth  - w) / 2;
  	var Win = 	window.open(
			adr, 
			'Help',  	
			'menubar=0, toolbar=0, location=0, directories=0, status=0, scrollbars=1, resizable=1, ' + 
			'width='+w+', height='+h+', left='+l+', top='+t);
	}