Problem event click

Problem event click

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?

Thanks!

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 -->