var actual=1;

function changeOpac(opacity, id) {
    var object = document.getElementById(id).style;
    object.opacity = (opacity / 100);
    object.MozOpacity = (opacity / 100);
    object.KhtmlOpacity = (opacity / 100);
    object.filter = "alpha(opacity=" + opacity + ")";
}

function changecapa(millisec, maximo) {
    var speed = Math.round(millisec / 50);
    var timer = 0;
    var div="blend";
    div1=div+actual;
    if (actual==maximo){
    	div2=div+"1";
    	actual=1;
    }
    else
    {
    	div2=div+(actual+1);
    	actual=actual+1;
    }
    
    document.getElementById(div1).style.visibility="hidden";
    changeOpac(0, div2);
    document.getElementById(div2).style.visibility="visible";
    
    for(i = 0; i <= 100; i++) {
        setTimeout("changeOpac(" + i + ",'" + div2 + "')",(timer * speed));
        timer++;
    }
  
}

function comenzar(maximo){
	document.getElementById("blend1").style.visibility="visible";
	m_iInterval = setInterval("changecapa(200,"+maximo+")", 5000);
}