How to count the number of characters of a post?

[GoyoH]

Thanks very much, Lynne.

I can do some little things with PHP, but I don't know how to do a plugin.

It could function this?:

<vb:if condition="strlen ($message)"> 5000

"show ad 1"

</vb:if>

<vb:if condition="strlen ($message)"<= 5000

"show ad 2"

</vb:if>

Thanks.