var current_top=0;
var scroll_dir="";
var div_height=400;
var scroll_window_height=100;
var scroll_amount=5;
var scroll_time=10;

function scroll_up() {
	scroll_dir="up";
	/*
	var scroller=document.getElementById('gallery_nav_scroll_area');
	current_top=current_top-10;
	scroller.style.top=current_top + "px";
	setTimeout("scroll_up()",100);
	*/
}

function scroll_down() {
	scroll_dir="down";
	/*
	var scroller=document.getElementById('gallery_nav_scroll_area');
	current_top=current_top+10;
	scroller.style.top=current_top + "px";
	setTimeout("scroll_down()",100);
	*/
}

function scroll_pics() {
	var scroller=document.getElementById('gallery_nav_scroll_area');
	if (scroll_dir=="up")
	{
		if (scroll_window_height - div_height < current_top)
		{
			//do nothing
			current_top=current_top-scroll_amount;
			scroller.style.top=current_top + "px";
		}
		else
		{
			//do nothing
		}
	}
	else if (scroll_dir=="down")
	{
		if (current_top >= 0)
		{
			//do nothing
		}
		else
		{
			current_top=current_top+scroll_amount;
			scroller.style.top=current_top + "px";
		}
	}
	setTimeout("scroll_pics()",scroll_time);
}

function load_scroller(load_scroll_amount,load_scroll_time) {
	scroll_amount=load_scroll_amount;
	scroll_time=load_scroll_time;
	div_height=document.getElementById('gallery_nav_scroll_area').offsetHeight;
	scroll_window_height=document.getElementById('gallery_nav_container').offsetHeight;
	no_scroll();
	scroll_pics();
}

function no_scroll() {
	scroll_dir="";
}