...

add(new JavaScriptReference("addEventJs",
			new ResourceReference(YourClass.class, "javascript/addEvent.js")));
add(new JavaScriptReference("sweetTitlesJs",
			new ResourceReference(YourClass.class, "javascript/sweetTitles.js")));

Alternatively, you can just add these 2 lines to your Wicket's Panel or WebPage without touching the HTML i.e. skip Step 6,

// for Wicket 1.4
add(JavascriptPackageResource.getHeaderContribution("javascript/addEvent.js"));
add(JavascriptPackageResource.getHeaderContribution("javascript/sweetTitles.js"));

// for Wicket 1.3.x
add(HeaderContributor.forJavaScript("javascript/addEvent.js"));
add(HeaderContributor.forJavaScript("javascript/sweetTitles.js"));

Step 9: Remove element's text from the tip

Change

display:block

to

display:none

in the CSS selector

div#toolTip p em

if you want to remove the text from targeted element e.g.

<a>

Step 8: Add the tooltip

Add the attribute "showtooltip" to the element that should show a tooltip (only elements with this attibute will show tooltips):

...