Trying to build Home page for a website that contains a clickable image

I want to make the image clickable and on hover I want to change the background image

<style media="all" type=text/css> 
  body {   
    background: url(http://ift.tt/1E63gf5) no-repeat center fixed;   
    -webkit-background-size: cover;   
    -moz-background-size: cover;  
    -o-background-size: cover;  
    background-size: cover;   
    position: relative; 
  }  
 </style> 

via Chebli Mohamed