How do I change the amount of dedicated video memory I use? PLS HELP!?

I have a Toshiba Satelite Laptop, with Windows 7, and a Mobile Intel (R) 5 Express Chipset Family (Microsoft Corporation WDDM 1.1) display adapter. The Chip type is from the 4 Series and the adapter string: Mobile Intel(R) GMA 4500MHD. My total available graphics memory is 1759 MB, but I only have 128 MB dedicated video memory, and 1631 shared system memory... Is there some way I could change or somehow transfer some of that shared memory to the video memory? In short, I'd like to have more than 128 MB video memory in use. Could I do something like that? If yes, how?