Hi JayDeep,
I have gone ahead and choose a different plugin, as I could not wait for the answer…But wanted to let you know, as I really did like your plugin!!
When I noticed that the fonts on my StudioPress theme were not changing (even tho I made the change in the css.style sheet), I checked with Firebug, and it showed that the template was taking on the font style from your plugin and not the template css.style sheet.
I removed your plugin to test, and the fonts immediately changed to my style of fonts…