Two Sided Printing

[iMacSE500]

I want to be able to manually print on two sides of my paper. I have a HP Deskjet 5740, and I know this option works on the printer (I have used it with XP just fine). However, under my printing dialog box I do not have a Two Sided option like I should. Does anyone know how I can get this drop down menu to appear?
Thanks for the help!

 

[EricNau]

Manually? As is print the odd pages, re-insert in tray, then print the even pages? You can do this in the "Paper handling" section, just select "odd pages" under the "Pages to print:" option, and then switch to "even pages."

I believe the option you're thinking of only applies to printers able to print double-sided papers automatically.