To show and hide different span tags when clicking on specific images, you can use the following jQuery script:
$("#img1").on('click', function() {
$("#div1").fadeIn();
$("#div2,#div3").fadeOut();
});
$("#img2").on('click', function() {
$("#div2").fadeIn();
$("#div1,#div3").fadeOut();
});
$("#img3").on('click', function() {
$("#div3").fadeIn();
$("#div1,#div2").fadeOut();
});
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.0.0/jquery.min.js"></script>
<img src="css/imagens/missao2.png" alt="mission" id="img1" />
<img src="css/imagens/missao2.png" alt="mission" id="img2" />
<img src="css/imagens/missao2.png" alt="mission" id="img3" />
<span id="div1" style="display:none;position:absolute;border:3px solid blue;">Span 1</span>
<span id="div2" style="display:none;position:absolute;border:3px solid blue;">Span 2</span>
<span id="div3" style="display:none;position:absolute;border:3px solid blue;">Span 3</span>