function Gallery()
{
	this.imageContainer = Gallery.arguments[0];
	this.path	= Gallery.arguments[1];
	this.pixMax	= Gallery.arguments[2];
	this.imageId = null;
	
	this.getZufall = function(n) {
		var nr = Math.random();
		nr *= n;
		nr = Math.ceil(nr);
		return nr;
	}
	
	this.setImage = function() {
		if(!this.imageId) { this.imageId = this.getZufall(this.pixMax); }
		document.getElementById(this.imageContainer).style.backgroundImage = "url(" + this.path + this.imageId + ".jpg)";
	}
	this.nextImage = function() {
		if(this.imageId == this.pixMax) { this.imageId = 1; }
		else { this.imageId++; }
		this.setImage();
	}
	this.prevImage = function() {
		if(this.imageId == 1) { this.imageId = this.pixMax; }
		else { this.imageId--; }
		this.setImage();
	}
}