Tidy and Merging Spans

Hello,
 
I am using tidy command line to merge nested span tags. when i run tidy command line with -c option, it merges nested span tags, but it also does below things that i don't want. I tried to find usage example or document, but i didn't find any. If you can help me to figure it out, it will be great.
 
Below is what happens with -c option, which i don't want.
 
1. Tidy replaces font tags with span.
2. Tidy removes all the styles and defines css for them. It also adds class attribute to all the tags,whereever i had style defined originally.
 
I also tried to use configuration file, but it didn't work.
 
Any help would be appreciated.
 
Thank You,
Bhavin
 

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