function setBG(el,imagePath) {
	var e = document.getElementById(el);
	var img = "url(" + imagePath + ")";
	e.style.backgroundRepeat = "no-repeat";
	e.style.backgroundImage = new String(img);
	e.style.backgroundPosition = "bottom";
	//e.style.backgroundColor = "transparent";
	return false;
}
function showContent(num, state) {			// 1 visible, 0 hidden
	var sItemId = "content" + num;
	var sTogId = "switch" + num;
	var oTog, oItem;
	if (document.layers) {					//NN4+
		oItem = document.layers[sItemId];
		oTog = document.layers[sTogId];
	}
	else if (document.getElementById) {		//gecko(NN6) + IE 5+
		oItem = document.getElementById(sItemId);
		oTog = document.getElementById(sTogId);
	}
	else if (document.all) {				// IE 4
		oItem = document.all[sItemId];
		oTog = document.all[sTogId];
	}
	oItem.style.display = state ? "" : "none";
	var sHref = "javascript:showContent(" + num + "," + (state ? "0" : "1") + ")";
	oTog.href = sHref;
	//oTog.innerHTML = state ? "Ocultar respuesta" : "Ver respuesta";
}