<html> <head> <script type="text/javascript" src="js/jquery-1.3.2.js"></script> <script type="text/javascript"> $(document).ready(function(){ $("div").animate({ fontSize: "10em", }, 1500 ); }); </script> <style> div { background-color:red; width:500px; height:500px; border:1px solid black; } </style> </head> <body> <body> <div>Click me</div> </body> </html>