Please hel me, i'm going crazy!
I've crerated a simple circle with gradient color and saved it as svg file...

At this point i want to set it as a mask of ani image.. This is the code


<img id="immy" src="http://www.hdwallpapersarena.com/wp-content/uploads/2012/05/22-amazing-landscape.jpg">


and this the css rule
PHP Code:
#immy
{
    -
webkit-mask-imageurl(cerchio.svg); /*chrome*/
    
maskurl(cerchio.svg#cer);  /*firefox*/

the mask works fine in chrome, but it dont make any result in firefox, where the image simply isn't showed (such if the mask hide it completely)