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();

 }

}