Click on muiltiple image and show this image

<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.12.4/jquery.min.js"></script>

<script>

$(document).ready(function(){

    $('img[alt="thamb"]').click(function(){

        var trial = $('img[alt="thamb"]').attr('src');

        $('img[alt="mainimg"]').attr("src", trial);

    });

});

</script>

<script>

$(document).ready(function(){

    $('img[alt="thamb3"]').click(function(){

        var trial = $('img[alt="thamb3"]').attr('src');

        $('img[alt="mainimg"]').attr("src", trial);

    });

});

</script>

<script>

$(document).ready(function(){

    $('img[alt="thamb2"]').click(function(){

        var trial = $('img[alt="thamb2"]').attr('src');

        $('img[alt="mainimg"]').attr("src", trial);

    });

});

</script>