/**
*	Version: 0.1.1
*	Date:	2008-03-05
*	Author:	Dietrich Roland Pehlke
*/

var d=document;
var mode = "still";
var speed = 20; // in Millisekunden
var step_size = 2; // Schrittweite

function scroll( aNum) {
	
	// alert ("Ref= "+ref);
	switch(aNum) {
		case 1: // scroll up
			mode = "scroll_up";
			break;
			
		case -1: // scroll down
			mode = "scroll_down";
			break;
			
		case 0: // stop scrolling
			mode = "still";
			break;
	}
	do_scroll();
}

function do_scroll() {
	
	var ref = d.getElementById("bottom-content-pnav");
	
	switch (mode) {
		case "still": // nothing
			break;
		
		case "scroll_up":
			ref.scrollTop-=step_size;
			window.setTimeout("do_scroll()", speed);
			break;
			
		case "scroll_down":
			ref.scrollTop+=step_size;
			window.setTimeout("do_scroll()", speed);
			break;
	}
}