Is there a way to quick toggle cameras? Let's say I have 4 cameras on a scene:



I would like to render with the first camera, see what it looks like, then switch to the "next" camera quickly and see what that render looks like.

Currently, to switch cameras I have to click on a camera and set it as active and finally I can render (I don't have a number pad so I have to go to the menu and set it each time; else I'd use Ctrl+0). What I would like to know is whether there is a way to switch cameras and set it as active all in one step?

EDIT:
I'm not asking how to set a camera as active, that's doable via menu, what I'm asking for is a guide for a "quick toggle" between cameras; a quick way to switch active cameras without an animation.
It's possible with a little addon:

bl_info = {
    "name": "Cycle Cameras",
    "author": "CoDEmanX",
    "version": (1, 0),
    "blender": (2, 65, 0),
    "location": "View3D &gt; Ctrl + Shift + Left/Right Arrow",
    "description": "Switch scene camera to next or previous camera object",
    "warning": "",
    "wiki_url": "",
    "category": "3D View"}

import bpy

class VIEW3D_OT_cycle_cameras(bpy.types.Operator):
    """Cycle through available cameras"""
    bl_idname = "view3d.cycle_cameras"
    bl_label = "Cycle Cameras"
    bl_options = {'REGISTER', 'UNDO'}

    direction = bpy.props.EnumProperty(
        name="Direction",
        items=(
            ('FORWARD', "Forward", "Next camera (alphabetically)"),
            ('BACKWARD', "Backward", "Previous camera (alphabetically)"),
        ),
        default='FORWARD'
    )

    def execute(self, context):
        scene = context.scene
        cam_objects = [ob for ob in bpy.data.objects if ob.type == 'CAMERA']

        if len(cam_objects) == 0:
            return {'CANCELLED'}

        try:
            idx = cam_objects.index(scene.camera)
            new_idx = (idx + 1 if self.direction == 'FORWARD' else idx - 1) % len(cam_objects)
        except ValueError:
            new_idx = 0

        context.scene.camera = cam_objects[new_idx]
        return {'FINISHED'}


addon_keymaps = []

def register():
    bpy.utils.register_module(__name__)

    wm = bpy.context.window_manager
    kc = wm.keyconfigs.addon
    if kc:
        km = wm.keyconfigs.addon.keymaps.new(name='3D View', space_type='VIEW_3D')
        kmi = km.keymap_items.new(VIEW3D_OT_cycle_cameras.bl_idname, 'RIGHT_ARROW', 'PRESS', ctrl=True, shift=True)
        kmi.properties.direction = 'FORWARD'
        addon_keymaps.append((km, kmi))
        kmi = km.keymap_items.new(VIEW3D_OT_cycle_cameras.bl_idname, 'LEFT_ARROW', 'PRESS', ctrl=True, shift=True)
        kmi.properties.direction = 'BACKWARD'
        addon_keymaps.append((km, kmi))

def unregister():
    for km, kmi in addon_keymaps:
        km.keymap_items.remove(kmi)
    addon_keymaps.clear()
    bpy.utils.unregister_module(__name__)


if __name__ == "__main__":
    register()


An operator to cycle through available camera objects is bound to CtrlShiftLeft Arrow to go to (alphabetically) previous camera and CtrlShiftRight Arrow to go to next camera.