<script type="text/javascript" language="javascript">
function karakter_kontrol()
{
    if (document.getElementById("q").value.length < 3)
    {
        alert("Kelime 3 karakterden az olamaz!");
        //window.location = "/";
        return false;
    }
    if (document.getElementById("q").value == 'öküz')
    {
        alert("geçersiz arama");
        //window.location = "/";
        return false;
    }
}
</script>


<form action=""">
    <input type="text" id="q" value="" />
    <input type="button" value="send" onclick="karakter_kontrol(); />
</form>