/**********************************************************
	slideshow.js
	
	1.サムネイル画像をNs.jpgにする。
	2.本画像をN.jpgにする。
	3.<a href="javascript:changeImage(1);" name="slide"><img src="img/1s.jpg" width="" height="" alt="" /></a>

**********************************************************/

var nowImageNumber = 1;
var MAXIMAGENUMBER = document.getElementsByName("slide");
function changeImage(imgname,imageNumber){
	nowImageNumber = imageNumber;
	document.targetimage.src = imgname;
}
function prevImage(imgpath){
	if(nowImageNumber == 1){
		nowImageNumber = MAXIMAGENUMBER.length;
	}
	else{
		nowImageNumber -= 1;
	}
	document.targetimage.src = imgpath + nowImageNumber+".jpg";
}
function nextImage(imgpath){
	if(nowImageNumber == MAXIMAGENUMBER.length){
		nowImageNumber = 1;
	}
	else{
		nowImageNumber += 1;
	}
	document.targetimage.src = imgpath+nowImageNumber+".jpg";
}