/* Show or hide specific elements, by ID, with an A tag */
function showhide(id) {
	if(document.getElementById) {
		obj = document.getElementById(id);
		if(obj.style.display == "none") {
			obj.style.display = "";
		} else {
			obj.style.display = "none";
		}
	}
}

function turnbuckle(id) {
	if(document.getElementById) {
		var turnbuckle = document.getElementById(id);
		if(turnbuckle.src == master_logo_path+"/turnbuckle-plus.gif") {
			turnbuckle.src = master_logo_path+"/turnbuckle-minus.gif"
		} else {
			turnbuckle.src = master_logo_path+"/turnbuckle-plus.gif"
		}
	}	
}

function showhideall (action) {
	//show or hideall of the descriptions
	if(document.getElementById) {
		var divs = document.getElementsByTagName("div");
		for (var i = 0, n = divs.length; i < n; i ++) { 
			if (divs[i].className == "sessionDescriptions") {
				if (action == "show") divs[i].style.display="";
				else divs[i].style.display="none";
			}
		}
	
		//change all the turnbuckles to + or - depending on whether we just showed all or hid all
		var imgs = document.images;
		for (var i = 0; i < imgs.length; i ++) {
			if (action == "show") {
				if(imgs[i].src == master_logo_path+"/turnbuckle-plus.gif" && imgs[i].attributes['id'].value != "turnbuckle_master_open" && imgs[i].attributes['id'].value != "turnbuckle_master_close") {
					imgs[i].src = master_logo_path+"/turnbuckle-minus.gif"
				} 
			} else if (action == "hide") {
				if(imgs[i].src == master_logo_path+"/turnbuckle-minus.gif" && imgs[i].attributes['id'].value != "turnbuckle_master_open" && imgs[i].attributes['id'].value != "turnbuckle_master_close") {
					imgs[i].src = master_logo_path+"/turnbuckle-plus.gif"
				}
			}
		}
	}
}