// JavaScript Document
var counter=3;
function scrollUp() {
	var sidePanel=document.getElementById('sidePanel');
	var count=document.getElementsByName('panelBtn');
	var upBtn=document.getElementById('upBtn');
	var dwnBtn=document.getElementById('dwnBtn');
	sidePanel.scrollTop -= 64;
	if(counter<=3) {
		upBtn.style.backgroundImage='url(images/toolbar_icons/arrow_up_disabled.gif)';
		dwnBtn.style.backgroundImage='url(images/toolbar_icons/arrow_down.gif)';
	} else {
		counter--;
		upBtn.style.backgroundImage='url(images/toolbar_icons/arrow_up.gif)';
		dwnBtn.style.backgroundImage='url(images/toolbar_icons/arrow_down.gif)';
	}
}
function scrollDwn() {
	var sidePanel=document.getElementById('sidePanel');
	var count=document.getElementsByName('panelBtn');
	var upBtn=document.getElementById('upBtn');
	var dwnBtn=document.getElementById('dwnBtn');
	sidePanel.scrollTop += 64;
	if(counter>=count.length-1) {
		dwnBtn.style.backgroundImage='url(images/toolbar_icons/arrow_down_disabled.gif)';
		upBtn.style.backgroundImage='url(images/toolbar_icons/arrow_up.gif)';
	} else {
		counter++;
		upBtn.style.backgroundImage='url(images/toolbar_icons/arrow_up.gif)';
		dwnBtn.style.backgroundImage='url(images/toolbar_icons/arrow_down.gif)';
	}
}