Mas Hachnasah (Israeli Income Tax) Edit
Teum Mas "Israeli Tax Coordination"
You can do this free online at Mas Hachnasa. After filling out the info they send you the signed and stamped forms in the mail.
Go to Mas Hachnasa (Note that the site does not work in Firefox)
For other Israeli Tax issues see their web
And while we are on the topic, there is a nice salary calculator at Hilan Put in your Bruto (gross) and it will show you your Neto.