function $(id){id=document.getElementById(id);return id;}
function moverID(id,desde,hasta,speed)
{
	var Obj=document.getElementById(id);
	if(desde<hasta){
	try{
		Obj.style.left=parseInt(desde)+"px";
		var valor=parseFloat(desde)+((parseFloat(hasta)-parseFloat(desde))/5);
		if((valor+1)>hasta)
		valor=hasta;
		document.getElementById(id).t=setTimeout("moverID('"+id+"',"+valor+","+hasta+","+parseFloat(speed)+");",speed);
	}catch(err){alert(err.message+"mensaje error");}	
	}
	else if(desde>hasta){
		Obj.style.left=desde+"px";
		var valor=parseFloat(desde)-((parseFloat(desde)-parseFloat(hasta))/5);
		if((valor-1)<hasta)
		valor=hasta;
		document.getElementById(id).t=setTimeout("moverID('"+id+"',"+valor+","+hasta+","+(parseFloat(speed))+");",speed);	
	}
	else{
	Obj.style.left=hasta+"px";
	}
	
}
function cargaTumb(Obj,opacity,vel,src)
{
try{	
	var Obj1=$(Obj);
if(Obj1!=null){
	Obj1.style.opacity=opacity;
	Obj1.style.filter = "alpha(opacity=" + (parseFloat(opacity)*100) + ")";
	
	if(opacity>=1){
		return true;
			Obj1.style.filter = "alpha(opacity=" + 100 + ")";
	}
	else{
		var aux=(parseFloat(opacity)+0.2);
		Obj1.t=setTimeout("cargaTumb('"+Obj+"',"+aux+","+(vel)+",'"+src+"');",vel);
	}
}	
}
	catch(err){alert("error: "+err.message);}
}
function unloadTumb(Obj,opacity,vel,src)
{
try{	
	var Obj1=$(Obj);
if(Obj1!=null){
	Obj1.style.opacity=opacity;
	Obj1.style.filter = "alpha(opacity=" + (parseFloat(opacity)*100) + ")";
	
	if(opacity<=0){
		alert(Obj1.id);
		Obj1.parentNode.removeChild(Obj1);
		return true;
			Obj1.style.filter = "alpha(opacity=" + 0 + ")";
	}
	else{
		var aux=(parseFloat(opacity)-0.2);
		Obj1.t=setTimeout("cargaTumb('"+Obj+"',"+aux+","+(vel)+",'"+src+"');",vel);
	}
}
	else{alert("no encuentra el obj1");}
}
	catch(err){alert("error: "+err.message);}
}

function header(id)
{

	if(document.getElementById("bienvenida")){
		
		if(document.getElementById("bienvenida").getElementsByTagName("img").item(0)){
		setTimeout("document.getElementById('bienvenida').removeChild(document.getElementById('bienvenida').getElementsByTagName('img').item(0));",6000);
		}else{

		}
		var img=document.createElement("img");
		img.src="images/Bienvenidos/"+id+".jpg";
		img.id="rotaImg"+id;
		img.style.opacity=0;
		document.getElementById("bienvenida").appendChild(img);
		cargaTumb("rotaImg"+id,0,80,"stylo/header/head"+id+".jpg");
	}
}
function rotarImagen()
{
header(parseInt((Math.random()*100)/10));
}	
setInterval("rotarImagen();",10000);