last_keresoful = 'keresoful1';
function show(layerName) {
document.getElementById(layerName).style.display = '';
}

function hide(layerName) {
document.getElementById(layerName).style.display = 'none';
}
function show_next(keresoful_name) {
document.getElementById(last_keresoful).className = last_keresoful;
var curr = document.getElementById(keresoful_name);
curr.className=keresoful_name+'_hover';
hide(last_keresoful+'_data');
show(keresoful_name+'_data');
last_keresoful=keresoful_name;
}