<html>
<head>
<meta charset="windows-1251" />
</head>
<body>
<select id="sellinks_kr">
<option selected="selected" value="http://ya.ru">Авто</option>
<option value="https://www.google.com">Животные</option>
<option value="http://javascript.ru">Недвижимость</option>
</select>
<button id="butt">go</button>
<script>
butt.onclick=function(){
location=sellinks_kr.value
}
</script>
</body>
</html>