Bugs on class button disable

I am tying Disable button for 5 seconds after once submit. when I add css to submit button its diable whole button not even able to submit once
class="button button-3d button-small button-rounded button-black"

here is jquery script I am using to disable buttion for 5 sec after submit

$(document).ready(function(){ 
	$('#update_btn').click(function() {      
		var update_btn = $(this);      
		update_btn.prop('disabled', true);     
		setTimeout(function() {         
		update_btn.prop('disabled', false);     
		},5000);   //simple jQuery enable after 5 seconds 
	}); 
}); 

this works able to submit form
input name="Submit" type="submit" value="Add" alt="Add" id="update_btn"
not able to submit form when i add css to button css can't even sbmit once
input name="Submit" type="submit" value="Add" alt="Add" id="update_btn" class="button button-3d button-small button-rounded button-black"