http://localhost/Project.html?ProjectId=P6610C32F-7C54-4221-A190-A9E7E08F8B08

This is my weburl.

I want to retreive query string value of variable "ProjectId"

How i can do this using vbscript and html page

So just to verify what you are asking...which scenario?

vbscript -server side such as within an ASP web app
vbscript -client side (would only work with IE)
javascript -client side