$(window).resize(function(){ 

	var nAltoVentana = $(window).height();
	var nAltoContenedor = $('#div_contenedor_general').outerHeight();
	
	if(nAltoVentana > nAltoContenedor){
	    $('#div_contenedor_general').css({ 
	        position:'absolute', 
	        left: ($(window).width() - $('#div_contenedor_general').outerWidth())/2, 
	        top: ($(window).height() - $('#div_contenedor_general').outerHeight())/2 
	    }); 	
	}else{
	    $('#div_contenedor_general').css({ 
	        position:'absolute', 
	        left: ($(window).width() - $('#div_contenedor_general').outerWidth())/2
	    }); 		
	}

});