function gallery_prev(){
	cur_gallery -=1;
	if(cur_gallery == -1){
		// Перебрасываем на конец списка		
		cur_gallery = all_gallery-1;		 
	}	
	gallery_thumb(cur_gallery);	
	return false;
}

function gallery_next(){	
	cur_gallery +=1;
	if(cur_gallery == (all_gallery)){
		// Перебрасываем на начало
		cur_gallery = 0;		 
	}	
	gallery_thumb(cur_gallery);	
	return false;	
}

function gallery_thumb(){
	img_obj = document.getElementById('gallery_img');
	img_obj.src = gallery_ar[cur_gallery];
}