Print a $variable

[EnjoyNews]

Is it possible to make a print function that with a click on a button, sends
a $variable direct to a printer ?

I'm making a invoice system where my clients should be able to print their
invoices from their profile on my site..

The entire invoice is put in a $variable and echo'ed on the screen and it is
this variable they should be able to print.

 

[ahsan]

I am also looking for a solution to this problem.

I am using Ajax to load xhtml into an object and then i want to
window.print that object.
Any ideas guys?