Script to map Network shares

I'm going to assume you're referring to mounting the shares here, and not trying to map the network and to figure out which shares are present.

There are various ways to implement the mount; using login items is one possibility.

There are other approaches, such as configuring a profile for scripts that are run at login, too — if you have more than a few Mac systems around, then Apple would manage these via profiles or (maybe) via the older and increasingly-deprecated Open Directory MCX support.

First, have a look at your Group Policies or Mobile Device Management (MDM) tool, or whatever you're using in place of the Profile Manager tool that's incorporated into OS X Server. In particular, these details will determine what sort of scripts you can invoke on these Mac systems.

Most of these MDM tools will typically allow bash (or will allow invoking bash via AppleScript's do shell script mechanism), so Apple's Scripting Primer will get you started with bash command line scripting on OS X. This if you're interested in learning more about OS X and will be performing these login-related modifications yourself, and not via dragging the volume into the login payload or whatever your particular MDM supports. (Otherwise, you'll probably be outsourcing this work and/or hiring on a consultant — that'll probably be the fastest approach, if this is a quick one-off requirement, too.)

If you've decided to research and implement this yourself, you'll probably want to review the man mount_afp and man mount_smbfs man pages for details of the mount commands used at the command line, and for example commands. These two commands (combined with OS X or other keywords) can also provide you with Google or Bing search targets for existing examples posted around the forums and around the 'net.