function showComment(contentID){
document.getElementById('index.html').style.display="none";
document.getElementById('inet.html').style.display="none";
document.getElementById('products.html').style.display="none";
document.getElementById('devices.html').style.display="none";
document.getElementById('faq.html').style.display="none";
document.getElementById('calc.html').style.display="none";
document.getElementById('help.html').style.display="none";
document.getElementById('job.html').style.display="none";
document.getElementById('objlist.html').style.display="none";



document.getElementById('Hindex.html').style.display="none";
document.getElementById('Hinet.html').style.display="none";
document.getElementById('Hproducts.html').style.display="none";
document.getElementById('Hdevices.html').style.display="none";
document.getElementById('Hcalc.html').style.display="none";
document.getElementById('Hfaq.html').style.display="none";
document.getElementById('Hhelp.html').style.display="none";
document.getElementById('Hjob.html').style.display="none";

document.getElementById('Lindex').className="";
document.getElementById('Linet').className="";
document.getElementById('Lproducts').className="";
document.getElementById('Ldevices').className="";
document.getElementById('Lcalc').className="";
document.getElementById('Lfaq').className="";
document.getElementById('Lhelp').className="";
document.getElementById('Ljob').className="";

document.getElementById(contentID+'.html').style.display="block";
document.getElementById('H'+contentID+'.html').style.display="block";
document.getElementById('L'+contentID).className="item_active";
}

function showMenu(contentID){
document.getElementById('objlist.html').style.display="none";
document.getElementById(contentID+'.html').style.display="block";
}