Why isn't str_replace working?

[cdbsi]

I want to replace all of the ' in a string to \' because the string is later inserted into a inline dhtml event like this

<a href=javascript:void(0) onclick="dohint('David's birthday is today...')">

Notice that the ' in David's terminates the string early...
I need to replace the ' with \' before it is echoed.

I have tried str_replace like this...

$rowdesc=str_replace("'","\'",$rowdesc);

but it either returns an empty string or the original... 😕

What am I doing wrong?

[Duey]

im pretty sure its supposed to be like this:

$rowdesc=str_replace("\'","\'",$rowdesc);

[cdbsi]

just outputs the original string.... 🙁

also, I need to replace both ' and "