function showHideContentPO(what){
		var con=eval('PO_content'+what);
		var obr=eval('expand_collapse'+what);
		if (con.style.display=="none") {
			con.style.display="";
			obr.src="img/collapse.gif";
			obr.alt="Zabalit";
			putCookie('PO_content'+what,1,43200);  // 30 dnu
		}
		else{ 
			con.style.display="none";
			obr.src="img/expand.gif";
			obr.alt="Rozbalit";
			putCookie('PO_content'+what,0,43200);			 // 30 dnu
		}
	}
	
	function highlightPO(what,how){
		var obr=eval('PO_curve'+what);
		var radka=eval('PO_zahlavi'+what);
		var content=eval('PO_content'+what);
		if (how){
			obr.src = "img/curve_mo.gif";
			radka.style.backgroundColor='#3366CC';
			//radka.style.color='white';
			content.style.borderColor='#3366CC';
		}
		else {
			obr.src = "img/curve.gif";
			radka.style.backgroundColor='#8A956C';
			//radka.style.color='white';
			content.style.borderColor="#AEBE9F";
		}
	}