* Unitech official says Lehman in talks to invest more in projects
* Top gainers in major NSE, BSE indices - 10:30AM
* Equity Alert: Welspun-Gujarat up 9% on export duty exemption news
* Equity Alert: GAIL shrs up 3%; co to mull bonus share issue Jun 23
* Equity Alert: Steel shares up 2-10% on govt export duty exemption
* Highlights of JSW Steel's announceents at today's AGM
* Equity Alert: Cairn India down 3%; support seen at 270 rupees
* Equity Alert: Fertiliser cos up; Chambal Fertilisers at 52-wk high