How to do parameterization in VBscript Vuser

Hi,

I am trying to do parametrization in Vbscript Vuser. Here is the sample code

Dim i 

i = {Param}

here param is the parameter name. While compiling it is showing syntax error because {param} missing the Double quotes("")

if i change it as 

Dim i

i = "{param}"

it is running successfully. but it is not substituting the parameter value. it taking {param} as the hard coded value.

Please suggest me how to do parametrization in Vbscript Vuser