// JavaScript Document

var index = 1;

function showPre()
{
	index = index - 1;
	if (index<1)
		index = 17;
	document.getElementById('slideImg').src="slides/"+index+".jpg";
}

function showNext()
{
	index = index + 1;
	if (index>17)
		index = 1;
	document.getElementById('slideImg').src="slides/"+index+".jpg";
}