function showcont(menuid){
	var el1 = document.getElementById('csomag_alap');
	var el2 = document.getElementById('csomag_csaladi');
	var el3 = document.getElementById('csomag_extra');
	var el = document.getElementById(menuid);
	
	btia('graf_alap');
	btia('graf_csaladi');
	btia('graf_extra');
	bta(menuid.replace(/csomag_/, 'graf_'));
	el1.style.display = "none";
	el2.style.display = "none";
	el3.style.display = "none";
	el.style.display = "block";
	
	return true;
}

function bta(buttonid){
	var el = document.getElementById(buttonid);
	var objs = el.childNodes;
	for (var i = 0; i < objs.length; i++){
		var str = objs[i].className;
		if (str != undefined){
			objs[i].className = str.replace(/_ia/, "_a");
		}
	}
	return true;
}

function btia(buttonid){
	var el = document.getElementById(buttonid);
	var objs = el.childNodes;
	for (var i = 0; i < objs.length; i++){
		var str = objs[i].className;
		if (str != undefined){
			objs[i].className = str.replace(/_a/, "_ia");
		}
	}
	return true;
}