function parpadea() {
	var obj = document.getElementById("parpadea");
	if (window.timer!=null) {
		clearTimeout(window.timer);
	}
	if ( obj ) {
		window.colorParpadea = ( !window.colorParpadea ? obj.style.color : window.colorParpadea );
		window.colorParpadea = ( !window.colorParpadea ? "black" : window.colorParpadea );
		obj.style.color = ( obj.style.color==window.colorParpadea ? "yellow" : window.colorParpadea );
		window.timer = setTimeout("parpadea()",500);
	}
}
parpadea();