if(isCompatible())
function isCompatible(){
  var isIE5 = (navigator.userAgent.indexOf("MSIE 5") > 0) ? 1 : 0;
  var isIE55 = (navigator.userAgent.indexOf("MSIE 5.5") > 0) ? 1 : 0;
  var isIE6 = (navigator.userAgent.indexOf("MSIE 6") > 0) ? 1 : 0;
  var isIE7 = (navigator.userAgent.indexOf("MSIE 7") > 0) ? 1 : 0;
  var isNS6 = (navigator.userAgent.indexOf("Gecko")    > 0) ? 1 : 0;
  if(isIE55 || isIE6 || isIE7 || isNS6) {
    return 1;
  } else {
    return 0;
  }
}

function PopupWindow(href, w, h, settings)
{
    leftpos = (screen.width) ? (screen.width/2)-(w/2) : 0;
    toppos = (screen.height) ? (screen.height/2)-(h/2) : 0;
    settings = 'height='+h+',width='+w+',top='+toppos+',left='+leftpos+','+settings;
    var popupwindow = window.open(href, 'popupwindow', settings);
    popupwindow.focus();
   
}