Make an entity invisible dynamically by his name

[jahara]

Hi,
I need to dynamically or programatically make an entity (like a wall, door or a strucuture piece) visible or invisible by his name according to the project succeed.
I want to use Ruby Language to do that.
I saw a script that make an entity visible or invisible by layer but I need to do this by the name of an entity.
Can anyone help me with some script.
TKS
Carlos Jahara