/****************************************************/
/** Free script for any use, but please include    **/
/** a link to i-code.co.uk in any redistribution.  **/
/**                                                **/
/** Author : Stephen Griffin, www.i-code.co.uk     **/
/****************************************************/

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

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

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