Your webmaster or IT group should be able to do this. Worse comes to worse, you put a parental control program on it and limit the websites it can go to, to just yours.
What you refer to is a common method to demo the use of your site and often to show customers internet banking.
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AndyZ CRCM
My opinions are not necessarily my employers.
R+R-R=R+R
Rules and Regs minus Relationships equals Resentment and Rebellion. John Maxwell