function showHideValidParks()
{
	var ticketStyle = "";
	for (var i = 0; i < document.styleSheets.length; i ++)
	{
		var domain = document.styleSheets[i].href.split("/");
		if (domain[domain.length-1] == 'ticketgrid.css')
		{
			ticketStyle = document.styleSheets[i];
		}
	}
	
	var targetRule = "";

	dumpscript = "";
	for (key in ticketStyle)
	{
		dumpscript+= " "+ key;
	}
	
	var rules = "";
	if (ticketStyle.cssRules)
	{
		rules = ticketStyle.cssRules;
	}
	else
	{
		rules = ticketStyle.rules;
	}

	for (var i = 0; i < rules.length; i ++)
	{
		if (rules[i].selectorText == '.parkavailability'
			|| rules[i].selectorText == '.ticketValidAt'
			|| rules[i].selectorText == '.ticketInvalidAt'
		)
		{
			targetRule = rules[i].style;
			
			if (targetRule.display =="none")
			{
				targetRule.display = "";
			}
			else
			{
				targetRule.display = "none";
			}
			
		}
	}

	
	
	
}