var elements = new Array();



//Creates a plusMinusObject, wrapping around an HTML element, with the initial state being "closed."

function plusMinusObject(id)

{

	this.id = id;

	this.state = "closed";

}





//This method searches through already-processed-elements and picks a match. If no match is found, a new plusMinusObject is created and wrapped around

function showHidePlusMinus(id)

{

	var x;

	for(x = 0; x < elements.length; x ++)

	{

		if(elements[x].id == id)

		{

			break;

		}

	}

	

	if(x == elements.length)

	{

		x = elements.length;

		elements[x] = new plusMinusObject(id);

	}

	

	elements[x].showHidePlusMinus();

}



//This can be called on a plusMinusObject to either open or close it.

plusMinusObject.prototype.showHidePlusMinus = function ()

{

	if(this.state == "closed")

	{

		this.state = "open";

		document.getElementById(this.id).src = 'images/iconPlus.gif';

	}

	else

	{

		this.state = "closed";

		document.getElementById(this.id).src = 'images/iconMinus.gif';

	}

};