Ext.onReady(function(){
		var step = window.step || 0;
		var image_dir = "images/road_again/";
		
		var images = new Array("img01.jpg", "img02.jpg", "img03.jpg", "img04.jpg", "img05.jpg", "img06.jpg", "img07.jpg", "img08.jpg","img09.jpg", "img10.jpg");


		var descriptions = new Array(	" ",
										" ",
										" ",
										" ",
										" ",
										" ",
										" ",
										" ",
										" ",
										" "
											 );	
			

	var vimg = Ext.getDom('viewer_img');
	var vtext = Ext.getDom('viewer_text');
	
	Ext.get('next').on('click', function(){
		Ext.get('ss_left').show();
		step = step + 1;
		if(step>images.length-1){
			step=0;
		}
		vimg.src = image_dir + images[step];
		vtext.innerHTML = descriptions[step];
		if(step==images.length-1){
			Ext.get('ss_right').hide();
		}
	});
	
	Ext.get('prev').on('click', function(){
		Ext.get('ss_right').show();
		step = step - 1;
		if(step<0){
			step=images.length-1;
		}
		vimg.src = image_dir + images[step];
		vtext.innerHTML = descriptions[step];
		if(step==0){
			Ext.get('ss_left').hide();
		}
																			 
	});
	
	
	//load intial photo and text
	vimg.src = image_dir + images[step];
	vtext.innerHTML = descriptions[step];
	
	//hide previous button initially
	Ext.get('ss_left').hide();
	
});