function toggle_visibility(toggler) {
	// then target the element we need which is the span block...
	if(document.getElementById) {
		targetElement = toggler.parentNode.nextSibling;
		if(targetElement.className == undefined) {
			targetElement = toggler.parentNode.nextSibling.nextSibling;	
		}	
		if (targetElement.style.display == "block")	{
			targetElement.style.display = "none";
		} else {
			targetElement.style.display = "block";
		}
	}
}