function getStyleObject(objectId) {
    if(document.getElementById && document.getElementById(objectId)) {
		return document.getElementById(objectId).style;
    } else if (document.all && document.all(objectId)) {
		return document.all(objectId).style;
    } else if (document.layers && document.layers[objectId]) {
		return document.layers[objectId];
    } else {
		return false;
    }
}

function changeObjectVisibility(objectId, newVisibility) {
    var styleObject = getStyleObject(objectId);
    if(styleObject) {
		styleObject.visibility = newVisibility;
		return true;
    } else {
		return false;
    }
} 



function f_capa(capa,como) {
	if (como) {
		changeObjectVisibility(capa, "visible");
	} else {
		changeObjectVisibility(capa, "hidden");

	}
}