Untitled

jQuery disable all button of a css class and input type button
<input class="submit2" type="button" name="submit2"  value="Submit" id="submit1" onclick="">

$(document).ready(function() {

    $('.submit2').click(function() {

        $("input.submit2").attr('disabled', true);

    });
});

$(document).ready(function(){
    $('.submit2').click(function() {
        $(this).attr('disabled', true);
    });
});

$("input.submit2").attr('disabled',"disabled");

$("input.submit2").prop('disabled',true); // here jQuery will normalize the value and set the property

$(document).ready(function(){
     var $submitButton = $(this, "input[type='submit']");
     $submitButton.attr("disabled", "true");

$("input.submit2").attr('disabled','disabled');