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Here are my code:

<tr>
   <td><input name="clubId" type="text" class="input1" style="width:200px;" >
       <a href="javascript:isExistClubId();"><img src="/club/images/main/C_btn_check.gif" border="0" align="absmiddle" alt=""></a> 
   </td>
</tr>



function isExistClubId() {
        if(strLen(document.makeClub.clubId.value) > 20) {
            alert("Silahkan masukkan nama Klub hingga 40 karakter");
            document.makeClub.clubId.focus();
        } else if (!IsAlphaNumeric(document.makeClub.clubId.value)) {
            alert("Silahkan masukkan nama Klub dengan angka dan huruf.");
            document.makeClub.clubId.value = "";
            document.makeClub.clubId.focus();
        } else {
            var w = document.body.clientWidth, h = document.body.clientHeight;
            var popW = 350, popH = 200;
            var leftPos = (w - popW) / 2, topPos = (h - popH) / 2;
            window.open('/club/club/isExistClubId.vw?clubId='+document.makeClub.clubId.value,'subdomain','width=' + popW + ',height=' + popH + ',top=' + topPos + ', left=' + leftPos);
        }
    }

My problem is how to centered popup windows with this javascript? Help me, please.

Edited by silent lover
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