Calling ASP.NET WebService with variant culture decimal

Question

I am calling a webservice using jQuery.

The called method has a parameter of type decimal.

My site change culture based what user choices.

Before call webservice I use CompareValidator to validate, it do the right job, considering ThreadCulture.

I can use CompareValidator to convert my string to invariant at javascript? Because webservice always accept decimal as invariant

My last resource is accept values as string, and convert inside my method, considering ThreadCulture