var cBox;
function showCredits()
{
	cBox.show();
	return false;
}
function closeCredit()
{
	cBox.close();
}
function initCredit()
{
	cBox = new CreditBox();
}
function CreditBox()
{
	this.canvas = document.getElementById( "creditBox" );
}
var p = CreditBox.prototype;
p.show = function()
{
	if( !this.canvas ) return;
	this.canvas.style.display = "block";
}
p.close = function()
{
	this.canvas.style.display = "none";
}