var gko=navigator.userAgent.toLowerCase(); 
var div_banner_apar, div_banner_des, oPaz_des, oPaz_apar;
var banners_visibles=new Array("","banner_inf_1","banner_inf_2","banner_inf_3");
var pos_x_banners=new Array("",40,340,640); 

var banner_prox=4;

var num_espacios=3;
var espacio_act=1;

var z_index=2;

function Def_Trans(){
	if(banner_prox>num_banners)
		banner_prox=1;

	if(espacio_act>3)
		espacio_act=1;

	nom_banner_apar="banner_inf_"+banner_prox;
	div_banner_apar=document.getElementById(nom_banner_apar);
	div_banner_apar.style.left=pos_x_banners[espacio_act];
	div_banner_apar.style.zIndex=z_index;

	nom_banner_des=banners_visibles[espacio_act];
	div_banner_des=document.getElementById(nom_banner_des);

	banners_visibles[espacio_act]=nom_banner_apar;
	banner_prox++;
	espacio_act++;
	z_index++;

	if(gko.indexOf('gecko')!=-1){
			oPaz_des=div_banner_des.style.opacity;
			oPaz_apar=div_banner_apar.style.opacity;
			oPaz_apar=parseFloat(oPaz_apar);
			Trans_Img();			
			}else{
				oPaz_des=div_banner_des.filters.alpha.opacity;
				oPaz_apar=div_banner_apar.filters.alpha.opacity;
				Trans_Img_IE();
				}
	}

function Trans_Img(){
	if(oPaz_des>0.0){
		oPaz_des-=.05;
		oPaz_des=Math.round(oPaz_des*100)/100;		
		div_banner_des.style.opacity=oPaz_des;	

		oPaz_apar+=.05;	
		oPaz_apar=Math.round(oPaz_apar*100)/100;
		div_banner_apar.style.opacity=oPaz_apar;

		window.setTimeout("Trans_Img()",100);
		}else{
			window.setTimeout("Def_Trans()",3000);
			}
	}	

function Trans_Img_IE(){
	if(oPaz_des>0){
		oPaz_des-=5;
		div_banner_des.filters.alpha.opacity=oPaz_des;

		oPaz_apar+=5;
		div_banner_apar.filters.alpha.opacity=oPaz_apar;

		window.setTimeout("Trans_Img_IE()",100);
		}else{
			window.setTimeout("Def_Trans()",3000);
			}
	}