function addOnloadEvent(fnc){
  if ( typeof window.addEventListener != "undefined" )
    window.addEventListener( "load", fnc, false );
  else if ( typeof window.attachEvent != "undefined" ) {
    window.attachEvent( "onload", fnc );
  }
}
function removeOnloadEvent(fnc){
  if ( typeof window.removeEventListener != "undefined" )
    window.removeEventListener( "load", fnc, false );
  else if ( typeof window.detachEvent != "undefined" ) {
    window.detachEvent( "onload", fnc );
  }
}