<div class="submit">
<input id="submit-btn" type="submit" class="button" value="Отправить"disabled>
<div class="submit-after"></div>
</div>
.submit-after {
position: absolute;
left: 0;
right: 0;
top: 0;
bottom: 0;
cursor: pointer;
}
jQuery(".submit-after").click(function(evt) {
if(jQuery(this).prev("input[disabled]").prop("disabled")) {
alert("disabled");
jQuery(this).hide();
}
});