//for slideshows

function changeImage()
{

  var mySelect = document.getElementById('list');
  var theIndx = mySelect.selectedIndex;
  var MainImage = document.getElementById('mainimage');
  MainImage.src = mySelect.options[theIndx].value;
}

function prevImage()
{
	var mySelect = document.getElementById('list');
    var theIndx = mySelect.selectedIndex;
	
	if(theIndx == 0)
	{
		theIndx = mySelect.options.length-1;
	}
	else
	{
		theIndx--;
	}
	mySelect.selectedIndex = theIndx;
	changeImage();

}

function nextImage()
{
	var mySelect = document.getElementById('list');
	var theIndx = mySelect.selectedIndex;
	
	if(theIndx == (mySelect.options.length-1))
	{
		theIndx = 0;
	}
	else
	{
		theIndx++;
	}
	mySelect.selectedIndex = theIndx;
	changeImage();
}