function comprueba_formulario(cual){

	var cual;
	if(cual.texto.value=='Put your text here' || cual.texto.value==''){
		alert('We cannot make the search. Any character has not written');
		return false;
	}else{
	 	if(cual.texto.value.length<=2){
			alert('The text is very smaller. It can be an ambiguous search. Please, it specifies a minimum of 3 characters')
			return false;
		}
		else
		{
		url=cual.escondidoentresombras.value+'search/'+cual.categorias.value+'/'+cual.texto.value+'/';
		return cual.action=url;
		}
	}

}