var on = "toggleon"
var off = "toggleoff"

function change1(id)
{
document.getElementById('photos_manufacturing').className = on;
document.getElementById('photos_field').className = on;
document.getElementById('photos_rooftop').className = on;
document.getElementById('photos_modules').className = on;
document.getElementById('photos_recycling').className = on;
}

function change2(id)
{
document.getElementById('photos_manufacturing').className = on;
document.getElementById('photos_field').className = off;
document.getElementById('photos_rooftop').className = off;
document.getElementById('photos_modules').className = off;
document.getElementById('photos_recycling').className = off;
}

function change3(id)
{
document.getElementById('photos_manufacturing').className = off;
document.getElementById('photos_field').className = on;
document.getElementById('photos_rooftop').className = off;
document.getElementById('photos_modules').className = off;
document.getElementById('photos_recycling').className = off;
}

function change4(id)
{
document.getElementById('photos_manufacturing').className = off;
document.getElementById('photos_field').className = off;
document.getElementById('photos_rooftop').className = on;
document.getElementById('photos_modules').className = off;
document.getElementById('photos_recycling').className = off;
}

function change5(id)
{
document.getElementById('photos_manufacturing').className = off;
document.getElementById('photos_field').className = off;
document.getElementById('photos_rooftop').className = off;
document.getElementById('photos_modules').className = on;
document.getElementById('photos_recycling').className = off;
}

function change6(id)
{
document.getElementById('photos_manufacturing').className = off;
document.getElementById('photos_field').className = off;
document.getElementById('photos_rooftop').className = off;
document.getElementById('photos_modules').className = off
document.getElementById('photos_recycling').className = on;
}