function addLoadEvent( loadEvent )
{ 
	var oldOnLoad = window.onload;
	
	if ( typeof window.onload != 'function' )
	{ 
		window.onload = loadEvent; 
	}
	else
	{ 
		window.onload = function( )
		{ 
			if ( oldOnLoad )
			{ 
				oldOnLoad( );
			}
			
			loadEvent( ); 
		} 
	} 
}