function layerOnOff(layerName, layerState)
	{
		if (layerState == "on")
			{
				if (document.getElementById) 
					{
					document.getElementById(layerName).style.visibility = 'visible';
					
					}
				else if (document.layers && document.layers[layerName]) 
					{
					document.layers[layerName].visibility = 'visible';
					}
				else if (document.all) 
					{
					document.all[layerName].style.visibility = 'visible';
					}
			}
			else
			{
				if (document.getElementById) 
					{
					document.getElementById(layerName).style.visibility = 'hidden';
					}
				else if (document.layers && document.layers[layerName]) 
					{
					document.layers[layerName].visibility = 'hidden';
					}
				else if (document.all) 
					{
					document.all[layerName].style.visibility = 'hidden';
					}

			}
	}
	
	
function buttonchange(inImage, inLocation)
	{
	document.getElementById(inLocation).src = inImage; 	
	}
	

function randomImage(imgArr, imgType, imgUrl)
	{
		var imgSrc, r;
		r = randomNumber(imgArr.length);
		imgSrc = imgArr[r];
		document.write('<td><img src="' + imgUrl + imgType + imgSrc + '.gif" border="0"></td>');
	}
	
function randomNumber(limit)
	{
  		return Math.floor(Math.random()*limit);
	}