//grey-orange buttons (file-zone, tournaments)
 	var lasttab = "";
	function show_hide(x) {
		var els = document.getElementById(x);
		if(els != null) {
			els.style.display = (els.style.display == 'none' ? '' : 'none');
		}
	}

	function tabshow(x) 
	{
		if(lasttab != "") {
			show_hide(lasttab);
		}	
	show_hide(x);
	lasttab = x;
	}
	
	//tournaments at main page
	function  changeOsnova(){
	document.getElementById("oosnova").src="/images/osnova_a.png";
	document.getElementById("oosnova").style.cursor="default";
	document.getElementById("ddubl").style.cursor="pointer";
	document.getElementById("ddubl").src="/images/dubl_n.png";
	tabshow('cups_osnova');
	}	
	function  changeDubl(){
	document.getElementById("oosnova").src="/images/osnova_n.png";
	document.getElementById("oosnova").style.cursor="pointer";
	document.getElementById("ddubl").style.cursor="default";
	document.getElementById("ddubl").src="/images/dubl_a.png";
	tabshow('cups_dubl');
	}