function changeImage()
{
	var list = document.getElementById('optionlist');
	document.mainimage.src = list.options[list.selectedIndex].value;
}

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

function nextImage()
{
	var list = document.getElementById('optionlist');
	if(list.selectedIndex == list.options.length-1)
	{
		list.selectedIndex = 0;
	}
	else
	{
		list.selectedIndex++;
	}
	changeImage();
}
function openBrWindow(theURL,winName,features) { //v2.0
  window.open(theURL,winName,features);
}