Mouseenter and Mouseleave functions in IE is one of the main reasons why developers would sometimes have to tweak their applications specifically for IE. Not only is IE the most popular browser, the specific mouse-related commands are very easy to configure that it will effectively let the developers build an interactive application in no time. Of course, they would have to add additional functions, but an application that uses the ability of a mouse in an application would have to consider IE as it main browser. This function alone could be found in IE and other browsers would have to use a counterpart which is mouseover and mouseout. But a distinct difference in