Scripting Languages Differences
Although Dreamweaver built-in behaviors are very well written to cope with cross-browser compatibility, keep in mind that any extra behaviors that you might download and install from the Macromedia Exchange for Dreamweaver (http://www.macromedia.com/exchange/dreamweaver/) might not exhibit this attribute. As thorough and accurate as the code within them might be, there is no guarantee that the behaviors have been thoroughly checked for cross-browser compatibility unless they specifically state so. The way to get around thisas with any aspect of web developmentis to test at every stage. Nearly every web browser available is free to download, and so competent web developers have no excuse for not testing their work in every browser in which they expect their site to be viewed.
Although browsers are free to download, testing on other hardware platforms is a different matter. Many Internet cafes have a range of hardware that may differ from your own. Renting some time in one might save you an awful lot of redevelopment time later on.