var PicList = new Array();
var PicIndex = 0;
function InstallPics(){
PicList[0]="media/pictures/" + folder + "/1.jpg";
PicList[1]="media/pictures/" + folder + "/2.jpg";
PicList[2]="media/pictures/" + folder + "/3.jpg";
PicList[3]="media/pictures/" + folder + "/4.jpg";

}
function getNextPic(){
    PicIndex = (PicIndex + 1) % PicList.length;
    return PicList[PicIndex];
}
function getPrevPic(){
	
    PicIndex = (PicIndex - 1) % PicList.length;
	if (PicIndex < 0) {
	PicIndex = 2
	}
    return PicList[PicIndex];
}

function prevImage(){
	document.getElementById('mainimage').src = getPrevPic();
}
function nextImage(){
	document.getElementById('mainimage').src = getNextPic();
}

InstallPics();

function changeVis(){
		if (document.getElementById('text').style.display!="block") {
			document.getElementById('text').style.display="block";
			document.getElementById('vi').style.display="block";
			document.getElementById('vt').style.display="none";
		} else {
			document.getElementById('text').style.display="none";
			document.getElementById('vi').style.display="none";
			document.getElementById('vt').style.display="block";
		}
}

document.getElementById('mainimage').src = PicList[0];