function show() {

var sel = document.getElementById('services');
sel.style.display="block";

}
function hid() {
var sel = document.getElementById('services');
sel.style.display="none";

}

function show1() {

var sel = document.getElementById('ref');
sel.style.display="block";

}
function hid1() {

var sel = document.getElementById('ref');
sel.style.display="none";

}
function show2() {

var sel = document.getElementById('refer');
sel.style.display="block";

}
function hid2() {

var sel = document.getElementById('refer');
sel.style.display="none";

}