Global hotels group InterContinental Hotels's share price was given a boost after it saw revenue per available room grow by 6.7% from a year earlier in the first half of 2011. The increase was driven by strong demand in Greater China and the US, where the Holiday Inn relaunch is delivering sustained outperformance. Electricity generator International Power saw its share price drop despite pointing to its strong performance in the Americas as it unveiled a rise in revenues and profits in the half year to 30 June.The company admitted that growth in the Americas was "partially offset by lower results between periods in UK-Europe," International Power said. The economic troubles were hitting even silver and gold mining giant Fresnillo, usually regarded as a "safe" option during market instability. The stock was heading back south despite another all-time high gold price. FTSE 100 - RisersWeir Group (WEIR) 1,677.00p +6.14%ARM Holdings (ARM) 490.50p +5.71%InterContinental Hotels Group (IHG) 1,002.00p +4.05%IMI (IMI) 798.50p +3.57%Petrofac Ltd. (PFC) 1,145.00p +3.15%Antofagasta (ANTO) 1,168.00p +2.82%Cairn Energy (CNE) 291.30p +2.43%Rio Tinto (RIO) 3,464.50p +2.27%Johnson Matthey (JMAT) 1,704.00p +2.10%John Wood Group (WG.) 527.00p +1.84%FTSE 100 - FallersRoyal Bank of Scotland Group (RBS) 25.03p -8.18%International Power (IPR) 270.90p -5.38%Investec (INVP) 382.30p -5.09%Fresnillo (FRES) 1,719.00p -4.71%Old Mutual (OML) 103.30p -4.17%Legal & General Group (LGEN) 90.65p -3.87%Schroders (SDR) 1,407.00p -3.83%Schroders (Non-Voting) (SDRC) 1,140.00p -3.72%Capital Shopping Centres Group (CSCG) 302.10p -3.67%HSBC Holdings (HSBA) 519.30p -3.44%NR