Pass variables to PHP from javascript

[nelly27]

I'm trying to get a javascript script (running in a Safari extension, to be exact) to send a number of strings to a PHP script on my server. I got it working by constructing a URL with the variables in it, but I'd like to do it using POST to be more secure and incase one of the variables being passed through has an '&' in it.Is there a way I can do this? Thanks!