//---------------------------------------------------------
//---- vymena obrazku po najeti mysi ----
// pouze pro vlajky (nelze pouzit hover v css)
function imgSwitch(obj, img, path){
	if (obj != undefined && img != ''){
		obj.src = path+img;
	}
    return true;
}
//---------------------------------------------------------
//---------------------------------------------------------
//---- skryti/odkryti elementu ----
function roll (id, display){
	var element = document.getElementById(id);
	if (element != undefined){
		if(element.style.display==display || element.style.display==""){
			element.style.display="none";
		}
		else{
			element.style.display=display;
		}
	}
	return true;
}