Random Picture Slide show in VB 2010

Hello,
I'm a 100% newbie to programming, and have this project that i'm working on this project in which i have to select 3 pic and have to modes in the program "fixed" and
"random" in the FIXED mode i let the user input the number of cycle he/she wants in the slide show of the the 3 pic that will be showing in the groupbox. and for the
RANDOM mode, the user can select the starting pic same like fixed mode and than in start the slide show in a random location within the groupbox for ea picture. This picture shows for 2sec and changes to the next one.

for the project we need to have One Procedure and one Function.. the procedure I have figured out but the function part im having trouble with
the Function will be used whenever you need to generate a random number for the random mode. WHICH I DONT KNOW HOW TO DO :confused::confused:

also i dont know how to do the loops order for ea picture, by that i mean how do i work the timer so that the picture changes every 2sec to the next picture in the groupbox.

I have attached the "picture viewer" how it should turnout at the end if everything is well planed but I do know how to make it work like it working in that attachment.

the codes i have so far are this please help me figure this out :( :

Public Class Form1

Private intSeconds As Integer
Sub ViewerReset()

End Sub
Function RandomNumberGen(ByVal lowSeed As Integer, ByVal highSeed As Integer) As Double

End Function

Private Sub Form1_Load(sender As System.Object, e As System.EventArgs) Handles MyBase.Load
cboSelection.Items.Add("Sun Flower")
cboSelection.Items.Add("Long Water Fall")
cboSelection.Items.Add("Water Fall Wallpaper")

End Sub

Private Sub btnStartStop_Click(sender As System.Object, e As System.EventArgs) Handles btnStartStop.Click
If btnStartStop.Text = "Start" Then
btnStartStop.Text = "Stop"
Else
btnStartStop.Text = "Start"

End If
If radFixed.Checked = True Then
btnStartStop.Enabled = False
btnReset.Enabled = False

End If
If radRandom.Checked = True Then
btnReset.Enabled = False
End If
End Sub

Private Sub tmrSeconds_Tick(sender As System.Object, e As System.EventArgs) Handles tmrSeconds.Tick
intSeconds += 1

End Sub

Private Sub btnExit_Click(sender As System.Object, e As System.EventArgs) Handles btnExit.Click
'close the form
Me.Close()

End Sub

Private Sub GroupBox1_Enter(sender As System.Object, e As System.EventArgs) Handles GroupBox1.Enter

End Sub

Private Sub cboSelection_SelectedIndexChanged(sender As System.Object, e As System.EventArgs) Handles cboSelection.SelectedIndexChanged
Select Case cboSelection.SelectedIndex
Case 0
picSunFlower.Visible = True
Case 1
picSunFlower.Visible = False
picLongWaterFall.Visible = True
Case 2
picSunFlower.Visible = False
picLongWaterFall.Visible = False
picWaterFallWallpaper.Visible = True
End Select
End Sub

Private Sub btnReset_Click(sender As System.Object, e As System.EventArgs) Handles btnReset.Click
ViewerReset()

End Sub
End Class

Whenever you need something random, that basically means that you use the Random class. Create an instance and assign it to a member variable. Make sure that you do not create multiple instances and use them once each. Create one instance and use it multiple times. Each time you need a random number, you call its Next method. There are lots of examples around.