Logic scripting in landing pages? (Similar to velocity in emails)

Hello, I would like to know if it is possible, in a Marketo landing page, to write HTML (or Javascript) conditional to token value(s).  I guess similar to what you can do with Velocity scripting in emails, but in landing pages.  What I would like to do is something like:

if {{lead.Some Token}} = "someValue" then write this string "Hello".

The idea here is that I do not want to expose the value of {{lead.Some Token}} in the source HTML code of the page.

Thanks!