Acquiring stake in private limited company

Hi,

One of my client is having private limited company share capital of only 1 lac. He is in to IT domain, so he prepared a project and presented to various investors for funding. Project require huge funding say 5 crore. One of investor has shown interest in the project and ready to fund it. Now my question is how the capital restructuring could be done. He will have 50% stake, on the other side amount to be invested could be 5 crore or so. We have to maintain the capital ration @ 50% each.

Further what could be the best process to do it, which all laws will have to be complied ??

Thanks in anticipation