onmouse open

<input type="button" value="move" onmousemove="location.href='http://www.w3schools.com/css/css_dropdowns.asp'"/>

<input type="button" value="enter" onmouseenter="location.href='http://www.w3schools.com/css/css_dropdowns.asp'"/>

<input type="button" value="click" click="location.href='http://www.w3schools.com/css/css_dropdowns.asp'"/>

<div onclick="location.href='http://www.w3schools.com/css/css_dropdowns.asp'">


<div onmouseover="location.href='http://www.w3schools.com/css/css_dropdowns.asp'">
  <button>over</button>
</div>