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For small businesses, preventing theft and fraud by employees can be an uphill struggle.

Now a new generation of security technology aims to give small businesses an inexpensive defense against unscrupulous employees. Some of these systems let business owners who are on the road check their security cameras over the Internet and get email alerts if something unusual happens, such as employees closing up shop early.

Restaurants, meanwhile, can use tableside credit-card readers to prevent cashiers from stealing customers' card numbers or inflating the tips written on bills. And grocery stores can use a combination of security cameras and software to automatically spot cashiers who try to slip free products to their friends and family -- also known as "sweethearting."

These new products are arriving as stores face mounting losses from theft. According to the latest National Retail Security Survey, losses from "shrinkage" -- which includes theft, fraud and error -- reached a new high of about $40.5 billion in 2006. About half of that -- $19 billion -- came from employee theft. Shoplifting, in contrast, accounted for about a third.

Here's a look at some of the most innovative new security systems out there.