Спасибо помогло ...
function OnHashChange (event) {
conts = new Array ("sectionOne","sectionTwo","sectionThree");
hash = document.location.hash;
for(i=0;i<conts.length;i++) {
my = "#" + conts[i]
if (hash == my) {
document.getElementById(conts[i]).className = 'active'
} else {
document.getElementById(conts[i]).className = 'box'
}
}
}
<body onhashchange="OnHashChange (event);">