It's can't be done on the markup, but using JavaScript itself...
You may use jQuery
$(document).ready(
function() {
$("#elementid").click(function() {
alert("first");
});
$("#elementid").click(function() {
alert("second");
});
});
Or plain JavaScript
function eventHandler1()
{
alert("first");
}
function eventHandler2()
{
alert("second");
}
var el = document.getElementById("elementid");
el.addEventListener("click", eventHandler1);
el.addEventListener("click", eventHandler2);