I would like to put a drop shadow on a few images and have the coding...

-moz-box-shadow: 0px 0px 18px #525252;
-webkit-box-shadow: 0px 0px 18px #525252;
box-shadow: 0px 0px 18px #525252;

If i put this is the styling images box in atahualpa theme options, it creates every single picture with a drop shadow. WHere in my image coding do I insert the drop shadow coding?
Here is my image coding....

<h3 style="text-align: center;"><img class="aligncenter size-full wp-image-2308" alt="Amphibian Banner" src="http://clubfauna.com/wp-content/uploads/2013/03/Amphibian-Banner.png" width="800" height="100" /></h3>

I'ddo it in the CSS inserts and if you want to limit when it is used, put the image ID class in the selector