How do I use the Continue Shopping button?

When creating the link to the CartForm.aspx page to add an item, you need to add returnurl=pagename. For example, to have the Continue Shopping Button return you to MyPage.aspx, make the hyperlink CartForm.aspx?Itemno=MyItem&ReturnUrl=MyPage.aspx.
If you want the continue shopping button to redirect to a different site then the site the CartForm page is hosted on, you need to set the ReturnUrl to the entire path of the site you want to redirect to. ie, http://www.MySite.com/MyPage.html. Note that the sites URL must be URL encoded. In .Net you do this with HttpUtility.UrlEncode("http://www.MySite.com/Mypage.html")