upload multiple pdf files from local disk path to sharepoint document library or list using client object model

Hi,

 We have a requirement such as 

   Many pdf files are existed at local machine say c:\pdffolder\.  This is configurable at SP Site level.

On 1 button click , I have to read all pdf files and store them to document library. I don't have option to deploy at farm.

Please I request you suggest me client object model/sandbox solution code for this. With out code if there is any jQuery or SPServices is greatly appreciated.

Pls let me know 

Thanks

MLA