function ventanaEmergente(url)
{
	var wVen = 700;
	var hVen = 500;
	var wPantalla = screen.width;
	var hPantalla = screen.height;
	var posL = parseInt((parseInt(wPantalla)/2) - wVen/2);
	var posT = parseInt((parseInt(hPantalla)/2) - hVen/2)-50;
	var opciones = 'width='+wVen+',height='+hVen+',top='+posT+',left='+posL+',scrollbars=1,location=0';
	window.open(url,'ventanaEmergente', opciones);
}



///////////////// PRESENTACIONES /////////////////

var duration = 1000;  /* 1000 millisecond fade = 1 sec */
var steps = 20;       /* number of opacity intervals   */
var delay = 10000;     /* 5 sec delay before fading out */
var delay2 = 5000;     /* 7.5 sec delay before fading out */
var arrayPres1 = Array();
var posPres1 = 1;
var arrayPres2 = Array();
var posPres2 = 1;

///////////////// PRESENTACION 1 /////////////////
function setOpacity(level)
{
	var element = document.getElementById('imgPres1');
	element.style.opacity = level;
	element.style.MozOpacity = level;
	element.style.KhtmlOpacity = level;
	element.style.filter = "alpha(opacity=" + (level * 100) + ");";
}

function fadeIn()
{
	var presentacion1 = document.getElementById('imgPres1');
	var imagenSiguiente = 'img/presentacion/1/'+arrayPres1[posPres1];
	//alert('Imagen siguiente: '+imagenSiguiente);
	presentacion1.src = imagenSiguiente;
	if(posPres1 < arrayPres1.length-1)
		posPres1++;
	else
		posPres1 = 0;
		
	for (i = 0; i <= 1; i += (1 / steps))
	{
		setTimeout("setOpacity(" + i + ")", i * duration);
	}
	setTimeout("fadeOut()", delay);
}

function fadeOut()
{
	for (var i = 0; i <= 1; i += (1 / steps))
	{
		setTimeout("setOpacity(" + (1 - i) + ")", i * duration);
	}
	setTimeout("fadeIn()", duration);
}

///////////////// PRESENTACION 2 /////////////////

function setOpacity2(level)
{
	var element = document.getElementById('imgPres2');
	element.style.opacity = level;
	element.style.MozOpacity = level;
	element.style.KhtmlOpacity = level;
	element.style.filter = "alpha(opacity=" + (level * 100) + ");";
}

function fadeIn2()
{
	var presentacion2 = document.getElementById('imgPres2');
	var imagenSiguiente2 = 'img/presentacion/2/'+arrayPres2[posPres2];
	//alert('Imagen siguiente 2: '+imagenSiguiente2);
	presentacion2.src = imagenSiguiente2;
	if(posPres2 < arrayPres2.length-1)
		posPres2++;
	else
		posPres2 = 0;
		
	for (var i = 0; i <= 1; i += (1 / steps))
	{
		setTimeout("setOpacity2(" + i + ")", i * duration);
	}
	setTimeout("fadeOut2()", delay2);
}

function fadeOut2()
{
	for (i = 0; i <= 1; i += (1 / steps))
	{
		setTimeout("setOpacity2(" + (1 - i) + ")", i * duration);
	}
	setTimeout("fadeIn2()", duration);
}