function toggleToc() {
	if (!document.getElementById("toc")) return false;
	if (!document.getElementById("toggletoc")) return false;
	if (!document.getElementsByTagName) return false;
	var toc = document.getElementById("toc");
	var togglebt = document.getElementById("toggletoc");
	var toccontents = toc.getElementsByTagName("ol")[0];
	togglebt.onclick = function () {
		tocContents(toccontents);
		if (this.getAttribute("src").indexOf("plus") == -1)
			this.setAttribute("src","/wp-content/themes/lsdn/img/icn_toggle_plus.gif");
		else
			this.setAttribute("src","/wp-content/themes/lsdn/img/icn_toggle_minus.gif");
	}
}

function tocContents(contents) {
	if (contents.style.display=="none") {
		contents.style.display="block";
	} else {
		contents.style.display="none";
	}
}

addLoadEvent(toggleToc);