function toggle_visibility_nav1(id) {

var nav1 = document.getElementById(id);
var nav4 = document.getElementById('attorneys');
var nav5 = document.getElementById('news');

nav4.style.display = 'none';
nav5.style.display = 'none';

if(nav1.style.display == 'none')
nav1.style.display = 'block';
else
nav1.style.display = 'none';

}


function toggle_visibility_nav4(id) {

var nav1 = document.getElementById('practice-areas');
var nav4 = document.getElementById(id);
var nav5 = document.getElementById('news');

nav1.style.display = 'none';
nav5.style.display = 'none';

if(nav4.style.display == 'none')
nav4.style.display = 'block';
else
nav4.style.display = 'none';

}

function toggle_visibility_nav5(id) {

var nav1 = document.getElementById('practice-areas');
var nav4 = document.getElementById('attorneys');
var nav5 = document.getElementById(id);

nav1.style.display = 'none';
nav4.style.display = 'none';

if(nav5.style.display == 'none')
nav5.style.display = 'block';
else
nav5.style.display = 'none';

}