Will this power supply work with my pc ?

I have an inspiron 531 and want to upgrade the power just by 50 watts, which will then make the pc have 350 watts, will this power supply work with my pc ? http://www.pcworld.co.uk/martprd/store/pcw_page.jsp?BV_SessionID=@@@@2068799397.1230374148@@@@&BV_EngineID=cccjadegdghjlffcflgceggdhhmdgmh.0&page=Product&fm=null&sm=null&tm=null&sku=957068&category_oid=-28017