var effect_1 = null;

function objetoAjax(){
	var xmlhttp=false;
	try {
		xmlhttp = new ActiveXObject("Msxml2.XMLHTTP");
	} catch (e) {
		try {
		   xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");
		} catch (E) {
			xmlhttp = false;
  		}
	}

	if (!xmlhttp && typeof XMLHttpRequest!='undefined') {
		xmlhttp = new XMLHttpRequest();
	}
	return xmlhttp;
}

function ver_contenido(id,pagina){
	//alert(id);
//	document.getElementById(id).style.dislpay="";
		var Resultado = "";
	Resultado = document.getElementById(id);
	Resultado.style.display = "";
	ajax=objetoAjax();
	ajax.open("GET", pagina,true);
	ajax.onreadystatechange=function() {

		if (ajax.readyState!=4) 
		{
			Resultado.innerHTML = "<img src='imagenes/ajax-loader.gif'>";			
		}
		if (ajax.readyState==4) 
		{
			Resultado.innerHTML = ajax.responseText	
		}
		
	}

	ajax.send(null);
}


function cambiar_signo_a_menos(span,id,destino){
	//alert(span+" "+id+" "+destino+" "+pagina);
	Resultado = document.getElementById(id);
	Resultado.innerHTML = "<span id='"+span+"' class=\"arial_10_blanca\" style=\"cursor:pointer;\" onclick=\"cambiar_signo_a_mas('"+span+"','"+id+"','"+destino+"'); effect_1 = Effect.SlideUp('"+destino+"',{duration:1.0}); return true; \" onmouseout=\"\"><img src='img/_.gif' border='0'/></span>";
}


function cambiar_signo_a_mas(span,id,destino){		
	Resultado = document.getElementById(id);
	Resultado.innerHTML = "<span id='"+span+"' class=\"arial_10_blanca\" style=\"cursor:pointer;\" onclick=\"cambiar_signo_a_menos('"+span+"','"+id+"','"+destino+"'); effect_1 = Effect.SlideDown('"+destino+"',{duration:1.0}); return false;\"><img src='img/+.gif' border='0'/></span>";		
	}

function opacity(id, opacStart, opacEnd, millisec) {
    //speed for each frame
    var speed = Math.round(millisec / 100);
    var timer = 0;

    //determine the direction for the blending, if start and end are the same nothing happens
    if(opacStart > opacEnd) {
        for(i = opacStart; i >= opacEnd; i--) {
            setTimeout("changeOpac(" + i + ",'" + id + "')",(timer * speed));
            timer++;
        }
    } else if(opacStart < opacEnd) {
        for(i = opacStart; i <= opacEnd; i++)
            {
            setTimeout("changeOpac(" + i + ",'" + id + "')",(timer * speed));
            timer++;
        }
    }
	if(opacStart == 100){
		document.getElementById(id).style.display="none";
		}
	if(opacStart == 0){
		document.getElementById(id).style.display="";
		}
}

//change the opacity for different browsers
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 tamanio(id){
	document.getElementById(id).style.width=(screen.width-70)+"px";
	//document.getElementById(id).style.height=(screen.height-70)+"px";
	}