Click to keep expanding size of div

Click to keep expanding size of div

Hi,

I have a div which I want to increase in pixel size by 10px each time a button is checked. The change in size needs to be animated. At the moment, I can only get it to increase to a fixed dimension:

$(document).ready(function(){
            $("#expand").click(function(){
               $(".my-div").animate({
                  width: "10px"
               },1000);
            });
         });


How do I get it to keep expanding by 10px each click? My Javascript/jQuery isn't great, so sorry if this is really simple!

Thanks all...