Can i change my 3D settings for the intel graphics media accelerator for mobile to run css better?

Intel's graphics chipsets leave a lot to be desired. CS:S might run on it but nowhere near the capacity of a good nVidia card. Best bet is to turn off every "pretty" you can and turn down as much as you can. Your frame rate should improve. Use the Video Benchmark test built into CS:S to see how well it performs, it will probably help you adjust the settings. You might want to check steampowered forums to see if there is a howto on tweaking CS:S graphics for lightweight video cards - that's the beauty of valve's Source engine - it's amazingly scalable.