<html> <head> <style> .style1 { border:5px solid #cccccc; border-left-width:6px; font-family:verdana; font-weight:bold } .style2 { border:"none"; font-family:verdana; font-weight:bold } </style> </head> <body> Move mouse in and out to see the style change. <div style="width:230; height:100; background-color:beige" onmouseover="this.className='style1'" onmouseout="this.className='style2'">This is a div element. </div> </body> </html>