javascript - Access a property of a css block from jquery -

i have site heavily based on javascript, still want let modified css.
take example... there div has opacity modified when on hover through jquery, designer able choose value of opacity.
thinking on creating block in css declare constants, example:

.constants_someid{   opacity: 0.5; } 

and through jquery take opacity

 var opacity = jquery('css:constants_someid').attr('opacity'); 

i don't know if way these constants declaration, thats came mind right now.

what guys think?

thanks,
joe

define them in javascript file instead:

var settings = {     opacity: 0.5 }; 

that kind of syntax should easy enough designer modify. can use settings.opacity.

you use $.extend merge settings defined designer default settings:

var defaults = {     opacity: 0.9,     speed: 500 }  settings = $.extend({}, defaults, settings); // returns { opacity: 0.5, speed: 500 }