function turnon(imgName,lyrName,imgObject)
 {
   if (document.images)
    {
      imgOn=eval(imgObject + "on.src");

	if (document.layers)
	{
		if (document[imgName])
		     	document[imgName].src= imgOn;
	}
	else
	     	document[imgName].src= imgOn;
    }
 }

function turnoff(imgName,lyrName,imgObject)
 {
   if (document.images)
    {
     imgOff=eval(imgObject + "off.src");
 
	if (document.layers)
	{
		if (document[imgName])
		     	document[imgName].src= imgOff;
	}
	else
	      document[imgName].src= imgOff;
    }
}

function hidePoint(ptName,ptNumber)
{
	if (document.all||document.getElementById)
	{
		eval('document["'+ptName+ptNumber+'"].src='+ptName+'empty.src;');
	}
	else if (document.layers)
	{
		document[ptName+ptNumber].src= eval(ptName+'empty.src');
	}
}

function unhidePoint(ptName,ptNumber)
{
	if (document.all||document.getElementById)
	{
		eval('document["'+ptName+ptNumber+'"].src='+ptName+'.src;');
	}
	else if (document.layers)
	{
		document[ptName+ptNumber].src= eval(ptName+'.src');
	}
}

function expandPoint(ptName,ptNumber,lyrName)
{
	if (document.all||document.getElementById)
	{
		eval('document["'+ptName+ptNumber+'big"].src='+ptName+'big.src;');
		eval('document["'+ptName+ptNumber+'"].src='+ptName+'empty.src;');
	}
	else if (document.layers)
	{
		document[ptName+ptNumber+'big'].src=eval(ptName+'big.src');
		document[ptName+ptNumber].src= eval(ptName+'empty.src');
	}
}

function shrinkPoint(ptName,ptNumber,lyrName)
{
	if (document.all||document.getElementById)
	{
		eval('document["'+ptName+ptNumber+'big"].src='+ptName+'bigempty.src;');
		eval('document["'+ptName+ptNumber+'"].src='+ptName+'.src;');
	}
	else if (document.layers)
	{
		document[ptName+ptNumber+'big'].src= eval(ptName+'bigempty.src');
		document[ptName+ptNumber].src= eval(ptName+'.src');
	}
}

function doNothing()
{
	return(false)
}