function gebi(element_id){
	return document.getElementById(element_id);
}

function pestanas(nPestanas){
	this.nombrePestanas = nPestanas.split(',');
	this.pestanaActiva = this.nombrePestanas[0];

	this.activarPestana = function(p){
		var pestanas = this.nombrePestanas;
		
		p = (p=="")?this.pestanaActiva:p;
		for(var i=0; i<pestanas.length; i++){
			if(pestanas[i]==p) this.visualizarPestana(pestanas[i]);
			else this.ocultarPestana(pestanas[i]);
		}
		this.pestanaActiva = p;
	}
	
	this.visualizarPestana = function(pestana){
		selector = gebi('selector-'+pestana);
		pestana = gebi(pestana);
		
		selector.className = 'seleccionado';
		pestana.className = 'display-block';
	}
	
	this.ocultarPestana = function(pestana){
		selector = gebi('selector-'+pestana);
		pestana = gebi(pestana);
		
		selector.className = 'off';
		pestana.className = 'display-none';
	}
}