validator error code html5

http://www.countyfairgrounds.net/ohio/ohio.php

Line 749 Attribute change not allowed on element select at this point

Here is the code
it has something to do with "on change" but I don't know how to fix this

<form name="menuForm">
<select name="menu" style="font-family: Verdana,Arial,Helvetica; font-size: 10px; color: purple;
font-weight:bold; "on change="top.location.href =this.options[this.selectedIndex].value;" >

<select name="menu" style="…" onchange="top.location.href =this.options[this.selectedIndex].value;" >

thanks -- works