function toggleVisibility(myDivId)
{
	try
	{
		var myDiv = document.getElementById(myDivId);
		if (myDiv == undefined)
		{
			throw new Error("div not found:" + myDivId);
		}
		if (myDiv == null)
		{
			throw new Error("div must not be null:" + myDivId);
		}
		if (myDiv.style.visibility=="visible")
		{
			myDiv.style.visibility="hidden";
			myDiv.style.display="none";
		}
		else 
		{
			
			myDiv.style.display="block";
			myDiv.style.visibility="visible";
		}
	}
	catch (e)
	{
		alert (e);
	}
}

function lottaShowDiv(myDivId)
{
	try
	{
		var myDiv = document.getElementById(myDivId);
		if (myDiv == undefined)
		{
			throw new Error("div not found:" + myDivId);
		}
		if (myDiv == null)
		{
			throw new Error("div must not be null:" + myDivId);
		}
		myDiv.style.display="block";
		myDiv.style.visibility="visible";
	}
	catch (e)
	{
		alert (e);
	}
}

function lottaHideDiv(myDivId)
{
	try
	{
		var myDiv = document.getElementById(myDivId);
		if (myDiv == undefined)
		{
			throw new Error("div not found:" + myDivId);
		}
		if (myDiv == null)
		{
			throw new Error("div must not be null:" + myDivId);
		}
		myDiv.style.visibility="hidden";
		myDiv.style.display="none";
	}
	catch (e)
	{
		alert (e);
	}
}

function changeClass(myDivId, stylename)
{
	try
	{
		//alert("changeCalenderItem to: " + stylename);
		var myDiv = myDivId; //document.getElementById(myDivId);
		if (myDiv == undefined)
		{
			throw new Error("div not found:" + myDivId);
		}
		if (myDiv == null)
		{
			throw new Error("div must not be null:" + myDivId);
		}
		myDiv.className = stylename;
	}
	catch (e)
	{
		alert (e);
	}
}