/****************************************************/
/** 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 changeImageQS()
{
	var list = document.getElementById('optionlist');
	document.all.mainimage.src = list.options[list.selectedIndex].link;
	document.all.mainCaption.innerText = list.options[list.selectedIndex].caption;
}

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

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