I want to add an event handler to a paragraph for when any user clicks on it. For example, I have a paragraph which would show an alert when a user clicks it, but without using "onclick" on HTML. 

```
 <p id="p1">This is paragraph Click here..</p>
 <a href="http://www.google.com" id="link1" >test</a>
 document.getElementById('p1').onmouseover  = paragraphHTML; 

```