// JavaScript Document

function prepMoveElements(){
	if(!document.getElementsByTagName) return false;
	if(!document.getElementById) return false;
	if(!document.getElementById("scroller")) return false;
	if(!document.getElementById("slider")) return false;
	if(!document.getElementById("btn_left")) return false;
	if(!document.getElementById("btn_right")) return false;
	
	var container = document.getElementById("scroller");
	var slider = document.getElementById("slider");
	var upper = document.getElementById("btn_left");
	var downer = document.getElementById("btn_right");
	
	var shiftval = 500;
	
	downer.onclick = function() {
		if(!slider.style.left) {
			slider.style.left = "0px";
		}
		var final_x = (parseInt(slider.style.left)) - (shiftval);
		// alert(final_x);
		moveElement("slider", final_x, 30);
		return false;
	}
	
	upper.onclick = function() {
		if(!slider.style.left) {
			slider.style.left = "0px";
		}
		var final_x = (parseInt(slider.style.left)) + (shiftval);
		// alert(final_x);
		moveElement("slider", final_x, 30);
		return false;
	}
	
}

function prepRollOverElements(){
	if(!document.getElementsByTagName) return false;
	if(!document.getElementById) return false;
	if(!document.getElementById("slider")) return false;
	
	var slider = document.getElementById("slider");
	var links = slider.getElementsByTagName("a");
	
	for(var i=0; i<links.length; i++){
		links[i].onmouseover = function(){
			var images = this.getElementsByTagName("img");
			images[0].style.display = "none";
			images[1].style.display = "block";
		}
		links[i].onmouseout = function(){
			var images = this.getElementsByTagName("img");
			images[0].style.display = "block";
			images[1].style.display = "none";
		}
	}
}

addLoadEvent(prepMoveElements);
addLoadEvent(prepRollOverElements);