var act = 1
var prev = 1
var thumbs = new Array()

function getAll() {
	objects = document.getElementById('thumbs').getElementsByTagName('div');
	x=0
	for(i=0;i<objects.length;i++) {
		if(objects[i].id) {
			thumbs[x] = objects[i]
			x++
		}
	}
    return true
}

function getNextImage() {
    prev = act
    act++
    if(act > thumbs.length)
        act = 1
    selectImage(act)
    return true
}

function getPrevImage() {
    prev = act
    act--
    if(act < 1)
        act = thumbs.length
    selectImage(act)
    return true
}

function getImage(selected) {
    prev = act
    act = selected
    selectImage(act)
}

function selectImage(act) {
    document.getElementById('vis_headline').innerHTML = headlines[act-1]
    document.getElementById('vis').getElementsByTagName('img')[0].src = '../images/' + images[act-1] + '.jpg'
    document.getElementById('vis').getElementsByTagName('img')[0].alt = alt[act-1]
    document.getElementById('thumb_' + prev ).getElementsByTagName('img')[0].src = '../images/' + images[prev-1] + '_small.jpg'
    document.getElementById('thumb_' + act++ ).getElementsByTagName('img')[0].src = '../images/img_act.jpg'
    return true
}