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function CloseWebPage(){
 if (navigator.userAgent.indexOf("MSIE") > 0) {
  if (navigator.userAgent.indexOf("MSIE 6.0") > 0) {
   window.opener = null;
   window.close();
  } else {
   window.open('', '_top');
   window.top.close();
  }
 }
 else if (navigator.userAgent.indexOf("Firefox") > 0) {
  window.location.href = 'about:blank ';
 } else {
  window.opener = null;
  window.open('', '_self', '');
  window.close();
 }
}