function animar(aux,imagen){
if(aux == 10){
imagen.width=50; imagen.height=50;
}
if(aux == 11){
imagen.width=80; imagen.height=80;
}
if(aux == 20){
imagen.width=32; imagen.height=32;
}
if(aux == 21){
imagen.width=50; 
imagen.height=50;
}
}