Shares in Cookson are the best performing in the FTSE 250 after the engineer and ceramics group said it expects trading profit this year will be at the upper end of market forecasts and near to £110m after a stronger than anticipated rally in sales over the past three months.Investors have given the thumbs up to Yellow pages group Yell's plans to raise £660m through the issue of 1.572bn new shares at 42p, much more than it originally indicated.The forward order book has fallen slightly at construction and regeneration group Morgan Sindall but the group remains on track to hit 2009 targets and the shares are higher today.The heaviest faller in the mid-cap index is engineering support services firm Babcock International which posted a 30% increase in half year profit as good growth in Marine and Defence mitigated a decline in Rail, Engineering and Plant.FTSE 250 - RisersCookson Group (CKSN) 438.10p +11.31%Yell Group (YELL) 48.28p +7.29%Morgan Sindall (MGNS) 579.50p +5.27%Ashmore Group (ASHM) 294.70p +5.17%Spectris (SXS) 731.00p +3.61%DSG International (DSGI) 33.72p +3.44%Robert Wiseman (RWD) 470.00p +2.96%PayPoint (PAY) 475.00p +2.81%Premier Farnell (PFL) 151.90p +2.70%Ecofin Water & Power Opportunities (ECWO) 155.00p +2.65%FTSE 250 - FallersBabcock International Group (BAB) 609.00p -5.14%Punch Taverns (PUB) 89.50p -4.28%Ladbrokes (LAD) 119.90p -3.69%Dunelm Group (DNLM) 376.60p -3.44%Petropavlovsk (POG) 1,240.00p -3.43%Moneysupermarket.com (MONY) 77.50p -3.13%Mondi (MNDI) 337.30p -3.05%JD Wetherspoon (JDW) 472.70p -2.82%Rank Group (RNK) 83.15p -2.75%Atkins (WS) (ATK) 557.50p -2.19%