var left = 1;
var right = 5;
var newRight = 0;

function toggle(button,opt) {
	if(opt == 'on') {
		button.src = "/style/images/"+button.id+"_e.png";
		button.className = "enabled";
	} else {
		button.src = "/style/images/"+button.id+"_d.png";
		button.className = "disabled";
	}
}

function move(direction) {
		if(direction.className == 'enabled') {
			if(direction.id == 'forward') {
				var hide = document.getElementById("slide_"+left);
				newRight = right + 1;
				var show = document.getElementById("slide_"+newRight);
				hide.style.display="none";
				show.style.display="inline";
				right = newRight;
				left = left + 1;
				if(right == slideTotal) {
					toggle(direction,'off');
				}
				if(left > 1) {
					var back = document.getElementById('back');
					toggle(back,'on');
				}
			} else {
				newLeft = left - 1;
				var hide = document.getElementById("slide_"+right);
				
				var show = document.getElementById("slide_"+newLeft);
				hide.style.display="none";
				show.style.display="inline";
				left = newLeft;
				right = right - 1;
				if(left == 1) {
					toggle(direction,'off');
				}
				if(right < slideTotal) {
					var forward = document.getElementById('forward');
					toggle(forward,'on');
				}
			}
		}
}