var state;
state = 1;
function showhide(theNumber,value) {

    

	var theRules = new Array();
	if (document.styleSheets[0].cssRules) {
		theRules = document.styleSheets[0].cssRules;
	} else if (document.styleSheets[0].rules) {
		theRules = document.styleSheets[0].rules;
	}
	
	if (state == 1){
		theRules[theNumber].style.display = "none";
		document.getElementById('jams').style.display = "none";
		document.getElementById('koncerty').style.display = "";
		state = 0;
	}
	else {
		theRules[theNumber].style.display = "";
		document.getElementById('jams').style.display = "";
		document.getElementById('koncerty').style.display = "none";
		state = 1;
	}
	if (window.opera)
   document.body.style += "";
}