The flourishing idea of Semantic Web is realized as extension of the World Wide Web infrastructure. The WWW has rehabilitated interest in semantic interoperability between various semantic languages. Semantic languages like OWL, WSML and FIPA SL formalize WWW into machine process able and understandable, by their ability to represent machine interpretable contents on the Web. These semantic description languages differ in syntax and semantic representation, resulting in mismatches that hamper semantic information exchange and interoperability for cross service utilization among the resulting information systems. In this paper we propose agent based technique to facilitate translation among heterogeneous contents while preserving the semantics. We propose the architecture to realize the system in a middleware that enables agent based dynamic semantic interoperability between FIPA compliant software agents and semantic web languages including OWL and WSML. We have developed a prototype application through which a software agent communicate and use a web service published in OWL or WSML and vice versa.