var VGL = Class.create();
VGL.prototype = {
	initialize: function(mainContainer, menuContainer, lines, lineHeight) 
  	{
		this.mainContainer = $(mainContainer);
		this.menuContainer = $(menuContainer);
		this.lines = lines;
		this.lineHeight = lineHeight;
		this.currentline = 0;
	},
  
	setPicture: function(src)
	{
		this.mainContainer.src = src;
	},
	
	clickNavigation: function(direction)
	{
		if(direction == 'prev')
		{
			if(this.currentline <= 0) return;
			this.currentline--;
		}
		if(direction == 'next')
		{
			if(this.currentline >= (this.lines-1)) return;
			this.currentline++;
		}

		//new Effect.Move(this.menuContainer, { x: 0, y: this.currentline * this.lineHeight })
		this.menuContainer.style.top = '-' + (this.currentline * this.lineHeight) + 'px';
	}
}