function Querystring(qs) { // optionally pass a querystring to parse
	this.params = {};
	
	if (qs == null) qs = location.search.substring(1, location.search.length);
	if (qs.length == 0) return;

// Turn <plus> back to <space>
// See: http://www.w3.org/TR/REC-html40/interact/forms.html#h-17.13.4.1
	qs = qs.replace(/\+/g, ' ');
	var args = qs.split('&'); // parse out name/value pairs separated via &
	
// split out each name=value pair
	for (var i = 0; i < args.length; i++) {
		var pair = args[i].split('=');
		var name = decodeURIComponent(pair[0]);
		
		var value = (pair.length==2)
			? decodeURIComponent(pair[1])
			: name;
		
		this.params[name] = value;
	}
}

Querystring.prototype.get = function(key, default_) {
	var value = this.params[key];
	return (value != null) ? value : default_;
}

Querystring.prototype.contains = function(key) {
	var value = this.params[key];
	return (value != null);
}

function checkquerystring()
	{
		var qs = new Querystring();
	 
		if (qs.contains("cid"))
		{
			var v1 = qs.get("cid");

		   	var e = document.getElementById(v1); //toggle_visibility('p2');
			var e2 = document.getElementById(v1 + 'DownArrow'); //toggle_visibility('p2DownArrow');
			var e3 = document.getElementById(v1 + 'UpArrow'); //toggle_visibility('p2UpArrow')
		   	if(e.style.display == 'block')
			  	e.style.display = 'none';
		   	else
			  	e.style.display = 'block';
			if(e2.style.display == 'block')
			  	e2.style.display = 'none';
		   	else
			  	e2.style.display = 'block';
			if(e3.style.display == 'block')
			  	e3.style.display = 'none';
		   	else
			  	e3.style.display = 'block';
		}
	}