var imagenes = new Array();
var banner_retardo = 7000;
var banner_ban = true;
var banner_numero = 0;
var banner_rotar = true;
function cargar_banners(banner){
	if(banner == ''){
		var maximo 	= 4;
		var posib 	= maximo - 1;
		var aleat		= Math.random() * posib;
		aleat 			= Math.round(aleat);
	}
	else{
		aleat = parseInt(banner);
	}
	if(document.getElementById('div_banners_rotando')){
		var elementos = document.getElementsByTagName('img');
		var j=0;
		for(i=0; i<elementos.length; i++){
			if(elementos[i].className == 'img_banner'){
				imagenes[j] = elementos[i];
				j++;
			}
		}
		if(!document.getElementById('div_contenedor_banners_1')){
			contenedor		= document.getElementById('div_banners_rotando');
			var banner1 	= document.createElement('div');
			banner1.id 		= "div_contenedor_banners_1";
			banner1.name 	= "div_contenedor_banners_1";
			contenedor.appendChild(banner1);
		}
		if(!document.getElementById('div_contenedor_banners_2')){
			contenedor					= document.getElementById('div_banners_rotando');
			var banner2 				= document.createElement('div');
			banner2.id 					= "div_contenedor_banners_2";
			banner2.name 				= "div_contenedor_banners_2";
			banner2.style.top		= '-213px';
			banner2.style.left	= '0px';
			banner2.style.width	= '0px';
			banner2.style.height= '214px';
			contenedor.appendChild(banner2);
		}
		if(imagenes.length > 0){
			document.getElementById('div_contenedor_banners_1').style.background = 'url('+imagenes[aleat].src+') no-repeat 0 0';
			document.getElementById('div_contenedor_banners_1').onclick = function(){document.location = imagenes[aleat].alt;}
		}
		if(imagenes.length > 1){
			var aleat2; 
			if(aleat >= maximo){aleat2 = 0;}
			else{aleat2 = parseInt(aleat)+1;}
			if(!imagenes[aleat2]){aleat2=0;}
			document.getElementById('div_contenedor_banners_2').style.background = 'url('+imagenes[aleat2].src+') no-repeat 0 0';
			document.getElementById('div_contenedor_banners_2').onclick  = function(){document.location = imagenes[aleat2].alt;}
			if(!document.getElementById('div__boton_1')){
				contenedor 							= document.getElementById('div_banners_rotando');
				var boton1	 						= document.createElement('div');
				boton1.id 							= "div__boton_1";
				boton1.name 						= "div__boton_1";
				boton1.style.position 	= 'relative'; 
				boton1.style.left 			= '713px';
				boton1.style.top				= '-239px';
				boton1.style.height 		= '49px';
				boton1.style.width			= '67px';
				contenedor.appendChild(boton1);
				document.getElementById('div__boton_1').innerHTML	= '<a href="#" onclick="banner_anterior(\''+aleat+'\'); return false;"><img src="includes/banners/btn_izq.gif" alt="" title="" /></a>';
			}
			if(!document.getElementById('div__boton_2')){
				contenedor 							= document.getElementById('div_banners_rotando');
				var boton2	 						= document.createElement('div');
				boton2.id 							= "div__boton_2";
				boton2.name 						= "div__boton_2";
				boton2.style.position 	= 'relative'; 
				boton2.style.left 			= '781px';
				boton2.style.top				= '-288px';
				boton2.style.height 		= '45px';
				boton2.style.width			= '64px';
				contenedor.appendChild(boton2);
				document.getElementById('div__boton_2').innerHTML	= '<a href="#" onclick="banner_siguiente(\''+aleat+'\'); return false;"><img src="includes/banners/btn_der.gif" alt="" title="" /></a>';
			}
		}
		banner_numero = aleat;
	}
	if(banner_rotar == true){
		setTimeout("rotar_banner()",banner_retardo);
	}
}

function banner_anterior(numero){
	banner_ban = false;
	document.getElementById('div__boton_2').innerHTML	= '<img src="includes/banners/btn_der.gif" alt="" title="" />';
	document.getElementById('div__boton_1').innerHTML	= '<img src="includes/banners/btn_izq.gif" alt="" title="" />';
	if(numero == '0'){numero = imagenes.length - 1;}
	else{numero = numero-1;}
	document.getElementById('div_contenedor_banners_2').style.background = 'url('+imagenes[numero].src+') no-repeat 0 0';
	document.getElementById('div_contenedor_banners_2').onclick = function(){document.location = imagenes[numero].alt;}
	animacion_anterior(845,1,845,numero);
}

function animacion_anterior(total,incremento,final,numero){
	if(parseInt(total) > 0){
		total = total- incremento;
		incremento++;
		if(total < 0){total = 0;}
		document.getElementById('div_contenedor_banners_1').style.width = total+'px';
		document.getElementById('div_contenedor_banners_2').style.width = (final-total)+'px';
		document.getElementById('div_contenedor_banners_2').style.left = total+'px';
		setTimeout("animacion_anterior('"+total+"','"+incremento+"','"+final+"','"+numero+"')",5);
	}
	else{
		document.getElementById('div_contenedor_banners_1').style.background = document.getElementById('div_contenedor_banners_2').style.background;
		document.getElementById('div_contenedor_banners_1').onclick = document.getElementById('div_contenedor_banners_2').onclick;
		document.getElementById('div_contenedor_banners_1').style.width = final+'px';
		document.getElementById('div_contenedor_banners_1').style.left 	= '0px';
		document.getElementById('div_contenedor_banners_2').style.width = '0px';
		document.getElementById('div_contenedor_banners_2').style.left 	= '0px';
		document.getElementById('div__boton_1').innerHTML	= '<a href="#" onclick="banner_anterior(\''+numero+'\'); return false;"><img src="includes/banners/btn_izq.gif" alt="" title="" /></a>';
		document.getElementById('div__boton_2').innerHTML	= '<a href="#" onclick="banner_siguiente(\''+numero+'\'); return false;"><img src="includes/banners/btn_der.gif" alt="" title="" /></a>';
		banner_numero = numero;
	}
}

function banner_siguiente(numero){
	banner_ban = false;
	document.getElementById('div__boton_2').innerHTML	= '<img src="includes/banners/btn_der.gif" alt="" title="" />';
	document.getElementById('div__boton_1').innerHTML	= '<img src="includes/banners/btn_izq.gif" alt="" title="" />';
	if(numero == (imagenes.length-1)){numero =  0;}
	else{numero++;}
	document.getElementById('div_contenedor_banners_2').style.background = 'url('+imagenes[numero].src+') no-repeat 0 0';
	document.getElementById('div_contenedor_banners_2').onclick = function(){document.location = imagenes[numero].alt;}
	siguiente_anterior(845,1,845,numero);
}

function siguiente_anterior(total,incremento,final,numero){
	if(total > 0){
		total = total- incremento;
		incremento++;
		if(total < 0){total = 0;}
		document.getElementById('div_contenedor_banners_1').style.left 	= (final-total)+'px';
		document.getElementById('div_contenedor_banners_1').style.width = total+'px';
		document.getElementById('div_contenedor_banners_2').style.width = (final-total)+'px';
		setTimeout("siguiente_anterior('"+total+"','"+incremento+"','"+final+"','"+numero+"')",5);
	}
	else{
		document.getElementById('div_contenedor_banners_1').style.background = document.getElementById('div_contenedor_banners_2').style.background;
		document.getElementById('div_contenedor_banners_1').onclick = document.getElementById('div_contenedor_banners_2').onclick;
		document.getElementById('div_contenedor_banners_1').style.width = final+'px';
		document.getElementById('div_contenedor_banners_1').style.left 	= '0px';
		document.getElementById('div_contenedor_banners_2').style.width = '0px';
		document.getElementById('div_contenedor_banners_2').style.left 	= '0px';
		document.getElementById('div__boton_1').innerHTML	= '<a href="#" onclick="banner_anterior(\''+numero+'\'); return false;"><img src="includes/banners/btn_izq.gif" alt="" title="" /></a>';
		document.getElementById('div__boton_2').innerHTML	= '<a href="#" onclick="banner_siguiente(\''+numero+'\'); return false;"><img src="includes/banners/btn_der.gif" alt="" title="" /></a>';
		banner_numero = numero;
	}
}


function rotar_banner(){
	numero = banner_numero;
	if(banner_ban == true){
		document.getElementById('div__boton_2').innerHTML	= '<img src="includes/banners/btn_der.gif" alt="" title="" />';
		document.getElementById('div__boton_1').innerHTML	= '<img src="includes/banners/btn_izq.gif" alt="" title="" />';
		if(numero == (imagenes.length-1)){numero =  0;}
		else{numero++;}
		document.getElementById('div_contenedor_banners_2').style.background = 'url('+imagenes[numero].src+') no-repeat 0 0';
		document.getElementById('div_contenedor_banners_2').onclick = function(){document.location = imagenes[numero].alt;}
		siguiente_anterior(845,1,845,numero);
		setTimeout("rotar_banner()",banner_retardo);
	}
	else{
		banner_ban = true;
		setTimeout("rotar_banner()",1500);
	}
}