// JavaScript Document
function prepMove(){
	if(!document.getElementsByTagName) return false;
	if(!document.getElementById) return false;
	if(!document.getElementById("slidecontainer")) return false;
	if(!document.getElementById("slider")) return false;
	if(!document.getElementById("up_btn")) return false;
	if(!document.getElementById("down_btn")) return false;
	
	var container = document.getElementById("slidecontainer");
	var slider = document.getElementById("slider");
	var upper = document.getElementById("up_btn");
	var downer = document.getElementById("down_btn");
		
	if(container.offsetHeight > slider.offsetHeight) {
		container.style.height = (slider.offsetHeight + 10) + "px";
		downer.style.visibility = "hidden";
		upper.style.visibility = "hidden";
	}
	
	var shiftval = container.clientHeight;
	var maxtop = (0 - (slider.scrollHeight) + shiftval);
	var maxbtm = 0;
	
	// alert(shiftval);
	// alert(maxtop);
	
	downer.onclick = function() {
		if(!slider.style.top) {
			slider.style.top = "0px";
		}
		var final_y = (parseInt(slider.style.top)) - (shiftval);
		moveElement("slider", final_y, 40);
		return false;
	}
	
	upper.onclick = function() {
		if(!slider.style.top) {
			slider.style.top = "0px";
		}
		var final_y = (parseInt(slider.style.top)) + (shiftval);
		moveElement("slider", final_y, 40);
		return false;
	}
	
}

addLoadEvent(prepMove);