disable inherited transition (all) for only one css property
===

I have in my css file the following code, which globally turns on transitions on all links for all css properties on anchor elements>

    a{
    	display:block;
    	-webkit-transition: all 0.2s ease;
    	-moz-transition: all 0.2s ease;
    	-o-transition: all 0.2s ease;
    	-ms-transition: all 0.2s ease;
    	transition: all 0.2s ease;
    }

Later in css file, I would like to turn off transition on specific links (let's say with class "notrans") but only for background-position.
Something like>

    a.notrans{
    	-webkit-transition: background-position 0;
    	-moz-transition: background-position 0;
    	-o-transition: background-position 0;
    	-ms-transition: background-position 0;
    	transition: background-position 0;
    }

But this code does not work.

I must turn background-position transition and keep other transitions, so sprite - background image would not move on a.notrans ...

Thanks.