<script language="JavaScript">
function onopen()
{
var url =
"http://www.ftc.go.kr/bizCommPop.do?wrkr_no="+frm1.wrkr_no.value;
window.open(url, "bizCommPop", "width=750, height=700;");
}
</script>

<form name="frm1">
<input name="wrkr_no" type="text" value="<?php echo $default['de_admin_company_saupja_no']; ?>">
<input onclick="onopen();" type="button" value="팝업">
</form>

form 부분만 원하는 위치에 붙여놓기 하세요