$(document).ready(function(){ 
			
	$(window).resize(function(){ AjustarMenu(); });				
	
	function AjustarMenu()
	{
		var ancho = $(window).width();		
		var anchoLateral = ancho - 800;
		anchoLateral = anchoLateral/2;
		
		if (anchoLateral<0)
		  anchoLateral=0;
	
		$("#wMenu #fondoIzq").css("width",anchoLateral);
		$("#wMenu #fondoDer").css("width",anchoLateral);
	}
	
	AjustarMenu();
					

});