Код HTML:
<html>
<head>
<title>Menu</title>
<script language="JavaScript" type="text/JavaScript">
function jumpMenu(targ,selObj,restore){
eval(targ+".location='"+selObj.options[selObj.selectedIndex].value+"'");
if (restore) selObj.selectedIndex=0;
}
</script>
</head>
<body>
<form name="form1">
<select name="menu" onChange="jumpMenu('parent',this,0)">
<option value="1.html">1</option>
<option value="2.html">2</option>
<option value="3.html">3</option>
<option value="4.html">4</option>
</select>
</form>
</body>
</html>