You can add events in javascript to elements. I don't know if i ever saw this used but it can be very useful. I've seen this done a lot in actionscript.

To add an event to an element you get he element first in a variable (usually with document.getElementById(id) ) and then use the method addEventListener.

Here is an example:

<a href="#" id="link1">click here</a>

<script>
element1 = document.getElementById("link1");
element1.addEventListener('click',doSomething2,true)

function doSomething2()
{
    alert('The link was clicked and something was done');
}
</script>

click here