function PopVis(status) {
  if (status == '0') {
    document.getElementById('recall_pop_bg').style.visibility='hidden';
    document.getElementById('recall_form').style.visibility='hidden';
  } else {
//alert(status);
    centerbox();
//document.getElementById('recall_form').style.marginLeft = "200px";
    document.getElementById('recall_pop_bg').style.visibility='visible';
    document.getElementById('recall_form').style.visibility='visible';
    document.getElementById('recall_pop_bg').style.display="";
    document.getElementById('recall_form').style.display="";
  }

}

function centerbox() {
    mleft = document.documentElement.clientWidth / 2 - 250;
    mtop = document.documentElement.clientHeight / 2 - 250;

    document.getElementById('recall_form').style.marginLeft = mleft + "px";
    document.getElementById('recall_form').style.maeginTop = mtop + "px";

}