/*
Example of inline event handlers:
<input type="text" name="date" onchange="validateDate()" />
This is bad.
The purpose of markup is to describe a document's structure, not its programmatic behavior. And what if we need to set handlers for several events on a single element?
*/
// The unobtrusive solution:
<input type="text" name="date" id="date" />
/*
A script that runs when page is loaded into the browser, looks for relevant element(s) and set them up accordingly: (using jquery)
*/
var message = "mouse entered or left.";
// passing the variable in by value through eventData:
$('#date').bind('mouseenter mouseleave', {msg: message}, function(event) {
alert(event.data.msg);
});