JQuery :: Active Event Click - Slide Down Delay

I have a problem with two click functions, the problem is the slideDown delay, if I do click on 'titolMenuBLink' after 'titolMenuALink' the two contents appear on the web...How I can disable 'titolMenuBLink' until the complete action $('#contingutMenuA').slideDown (1500); is done?

CODE:
$(document).ready (function () {
$('#titolMenuALink').click (function () {
$('#contingutMenuB').slideUp ('fast');
document.getElementById ('titolMenuALink').style.color = '#3e609d';
document.getElementById ('titolMenuBLink').style.color = '#8397ba';
$('#contingutMenuA').slideDown (1500);
});
$('#titolMenuBLink').click (function () {
$('#contingutMenuA').slideUp ('fast');
document.getElementById ('titolMenuBLink').style.color = '#3e609d';
document.getElementById ('titolMenuALink').style.color = '#8397ba';
$('#contingutMenuB').slideDown (1500);
});});
<!-- Code Menu -->
<div id="titolSeccioLinia">
<div class="titolSeccio">Q pre-part i post part</div>
<div class="titolMenu titolMenuQpostpart titolMenuSeparador" id="titolMenuBLink">QPOSTPART G.A.H.</div>
<div class="titolMenu titolMenuQEmbaras titolMenuSeparador" id="titolMenuALink">Q EMBARÀS</div>
<div class="neteja"></div>
</div>
<-- End Code -->