[jQuery] How to use jGrowl's "theme" option?

[jQuery] How to use jGrowl's "theme" option?


Hello,
does anyone have an example how to use jGrowl's "theme" option? I want
to use display error messages in red and tried the following:
$.jGrowl('My error message',{theme: 'jgError'});
with the following in my css file:
.jgError
{
color: red;
}
but it didn't work. I am obviously doing something wrong here. Does
anyone have an example of how to do it right?
Thanks for your help
W. Rösler