function des_det()
{
document.getElementById('des').style.display="block";
document.getElementById('specs').style.display="none";
document.getElementById('reviews').style.display="none";
}

function specs_det()
{
document.getElementById('des').style.display="none";
document.getElementById('specs').style.display="block";
document.getElementById('reviews').style.display="none";
}

function reviews_det()
{
document.getElementById('des').style.display="none";
document.getElementById('specs').style.display="none";
document.getElementById('reviews').style.display="block";
}