pie chart - Rails and pie.htc does not load -

i put in pie.htc

alert('works');  

and move pie.htc every folder of project.

in css try this:

behavior: url('/assets/pie.htc'); behavior: url(/assets/pie.htc); behavior: url('pie.htc'); behavior: url('/public/pie.htc'); 

but not load - dont see alert pie.htc.

what should write in css , put pie file.