var galleryPictureDIV = "galleryPicture";
var galleryPictureDescriptionDIV = "galleryPictureDescription";

var pictureArray = new Array();
pictureArray[0] = "images/eingang.gif";
pictureArray[1] = "images/wartebereich_1.gif";
pictureArray[2] = "images/theke_beleuchtet.gif";
pictureArray[3] = "images/wartebereich_2.gif";
pictureArray[4] = "images/geraeteraum.gif";
pictureArray[5] = "images/behandlungszimmer_3.gif";
pictureArray[6] = "images/behandlungszimmer_1.gif";
pictureArray[7] = "images/behandlungszimmer_2.gif";

var pictureArrayDescriptions = new Array();
pictureArrayDescriptions[0] = "Eingangsbereich";
pictureArrayDescriptions[1] = "Wartebereich";
pictureArrayDescriptions[2] = "Wartebereich";
pictureArrayDescriptions[3] = "Wartebereich";
pictureArrayDescriptions[4] = "KG-Geräteraum";
pictureArrayDescriptions[5] = "Eines unserer Behandlungszimmer";
pictureArrayDescriptions[6] = "Eines unserer Behandlungszimmer";
pictureArrayDescriptions[7] = "Eines unserer Behandlungszimmer";


function showPicture(direction){
	var currentPicture = document.getElementById(galleryPictureDIV);
	var currentPictureDescription = document.getElementById(galleryPictureDescriptionDIV);
	var currentPictureSrc = ""; 
	if(currentPicture && currentPictureDescription){
		currentPictureSrc = currentPicture.src;
		for(var i=0; i<pictureArray.length; i++){
			if(currentPictureSrc.indexOf(pictureArray[i]) > 0){
				// just found the current image in the array, so we have to show the next one
				// in the array
				if(direction == "next"){
					if((i+1) == pictureArray.length){
						currentPicture.src=pictureArray[0];
						currentPictureDescription.innerHTML=pictureArrayDescriptions[0];
					} else {
						currentPicture.src=pictureArray[i+1];	
						currentPictureDescription.innerHTML=pictureArrayDescriptions[i+1];			
					}

				} else {
					if(i == 0){
						currentPicture.src=pictureArray[pictureArray.length - 1];
						currentPictureDescription.innerHTML=pictureArrayDescriptions[pictureArray.length - 1];
					} else {
						currentPicture.src=pictureArray[i-1];
						currentPictureDescription.innerHTML=pictureArrayDescriptions[i-1];
					}
				}
			}
		}
	}
}