function tab(g, a){
 document.getElementById(g).style.display="block";
 document.getElementById(a).style.display="none";

 document.getElementById(''+g+'a').style.backgroundImage="url(img/right_zaznacz.png)";
 document.getElementById(''+g+'a').style.color="#FFFFFF";
 document.getElementById(''+g+'a').style.padding="13px 0 0 0";
 document.getElementById(''+g+'a').style.margin="9px 0 0 0";
 document.getElementById(''+g+'a').style.height="28px";	

 document.getElementById(''+a+'a').style.backgroundImage="none";
 document.getElementById(''+a+'a').style.color="#f48e8e";
 document.getElementById(''+a+'a').style.height="28px";	
 document.getElementById(''+a+'a').style.padding="13px 0 0 0";
 document.getElementById(''+a+'a').style.margin="0 0 0 0";
}

function gr(co){	
	document.getElementById('cf1').style.backgroundImage="none";
	document.getElementById('cf2').style.backgroundImage="none";
	document.getElementById('cf3').style.backgroundImage="none";
	document.getElementById('gk1').style.display="none";
	document.getElementById('gk2').style.display="none";
	document.getElementById('gk3').style.display="none";	
	document.getElementById('cf'+co+'').style.backgroundImage="url(img/mainnews_hover.png)";
	document.getElementById('gk'+co+'').style.display="block";
}