if (document.images) 
	{
		// barra izquierda sobre nosotros

		muchomason = new Image();      muchomason.src    = "img/d_leftbar_boton_muchomas_spaon.gif";
		ventajaon = new Image();       ventajaon.src     = "img/d_leftbar_boton_ventaja_spaon.gif";

		muchomasoff = new Image();     muchomasoff.src   = "img/d_leftbar_boton_muchomas_spa.gif";
		ventajaoff = new Image();      ventajaoff.src    = "img/d_leftbar_boton_ventaja_spa.gif";

		// barra izquierda compañías

		ambalion = new Image();        ambalion.src      = "img/d_leftbar_boton2_ambalion.gif";
		agrexpoon = new Image();       agrexpoon.src     = "img/d_leftbar_boton2_agrexpoon.gif";
		alisanaon = new Image();       alisanaon.src     = "img/d_leftbar_boton2_alisanaon.gif";
		argentiaon = new Image();      argentiaon.src    = "img/d_leftbar_boton2_argentiaon.gif";
		chilecitoon = new Image();     chilecitoon.src   = "img/d_leftbar_boton2_chilecitoon.gif";
		salamandraon = new Image();    salamandraon.src  = "img/d_leftbar_boton2_salamandraon.gif";
		maximon = new Image();         maximon.src       = "img/d_leftbar_boton2_maximon.gif";

		ambalioff = new Image();       ambalioff.src     = "img/d_leftbar_boton2_ambali.gif";
		agrexpooff = new Image();      agrexpooff.src    = "img/d_leftbar_boton2_agrexpo.gif";
		alisanaoff = new Image();      alisanaoff.src    = "img/d_leftbar_boton2_alisana.gif";
		argentiaoff = new Image();     argentiaoff.src   = "img/d_leftbar_boton2_argentia.gif";
		chilecitooff = new Image();    chilecitooff.src  = "img/d_leftbar_boton2_chilecito.gif";
		salamandraoff = new Image();   salamandraoff.src = "img/d_leftbar_boton2_salamandra.gif";
		maximoff = new Image();        maximoff.src      = "img/d_leftbar_boton2_maxim.gif";

		// barra derecha compañías

		historiaon = new Image();	      historiaon.src        = "img/d_rightbar_boton_historia_spaon.gif";
		sobrenosotroson = new Image();  sobrenosotroson.src   = "img/d_rightbar_boton_sobrenosotros_spaon.gif";
		contactenoson = new Image();    contactenoson.src     = "img/d_rightbar_boton_contactenos_spaon.gif";
		catalogoon = new Image();       catalogoon.src        = "img/d_rightbar_boton_catalogo_spaon.gif";
		planillason = new Image();      planillason.src       = "img/d_rightbar_boton_planillas_spaon.gif";
		certificadoson = new Image();   certificadoson.src    = "img/d_rightbar_boton_certificados_spaon.gif";

		historiaoff = new Image();	    historiaoff.src       = "img/d_rightbar_boton_historia_spa.gif";
		sobrenosotrosoff = new Image(); sobrenosotrosoff.src  = "img/d_rightbar_boton_sobrenosotros_spa.gif";
		contactenosoff = new Image();   contactenosoff.src    = "img/d_rightbar_boton_contactenos_spa.gif";
		catalogooff = new Image();      catalogooff.src       = "img/d_rightbar_boton_catalogo_spa.gif";
		planillasoff = new Image();     planillasoff.src      = "img/d_rightbar_boton_planillas_spa.gif";
		certificadosoff = new Image();  certificadosoff.src   = "img/d_rightbar_boton_certificados_spa.gif";

	}

function imgOn(imgName) 
  {
    if (document[imgName]) 
      {
        document.images[imgName].src = eval(imgName + "on.src");
      }
  }
	
function imgOff(imgName) 
  {
    if (document[imgName]) 
      {
        document.images[imgName].src = eval(imgName + "off.src");
      }
  }