var minspeed = 1
var maxscrollspeed = 5
var scrollspeed
var accelerating = false
var deccelerating = false
var acceleration = .15
var decceration = .2
var currentDirection = null
scrolling = false
thelength = 1368;

function initialize(){
	upArrow = document.all? parent.document.all.upArrow : parent.document.getElementById("upArrow");
	downArrow = document.all? parent.document.all.downArrow : parent.document.getElementById("downArrow");
	marqueeheight=document.all? parent.document.all.scrollMenu.height : parent.document.getElementById("scrollMenu").getAttribute("height")

	upArrow.onmouseover=checkScroll;
	upArrow.onmouseout=stopScroll;
	downArrow.onmouseover=checkScroll;
	downArrow.onmouseout=stopScroll;
	
	dataobj=document.all? document.all.datacontainer : document.getElementById("datacontainer")

	
	// allow short period so that real offsetHeight of dataobj can be calculated
	// IE 5 WIN often displays 0
	setScrollTop=setTimeout("setTop()",200)
}

function setTop()  {
	thelength=dataobj.offsetHeight
	dataobj.style.top=(thelength/2) * -1 - vOffset
	if (setScrollTop){
		clearInterval(setScrollTop);
	}
}

function checkScroll() {

	if(this.id == "upArrow") {
		direction = 1
	} else {
		direction = -1
	}
	// scroll has been stopped
	if(currentDirection == null) {
		currentDirection = direction;
		scrolling = true
		accelerating = true
		deccelerating = false
		scrollspeed = minspeed
		// user has moved off arrow and moved back on 
		// while scroll is still moving
	} else if(currentDirection == direction){
		// change of direction
		
		if (recursiveScroll){
			clearInterval(recursiveScroll); 
		}
		accelerating = true
		deccelerating = false
	} else {

		if (recursiveScroll){
			clearInterval(recursiveScroll); 
		}
		currentDirection = direction;
		accelerating = true
		deccelerating = false
		scrollspeed = minspeed	
	}
		
		
		scrolltest(direction)

}

function scrolltest(direction){


	
	if(scrollspeed == null) {
		//accelerating = true
		//scrollspeed = minspeed
	}
	if(accelerating) {
		if (scrollspeed < maxscrollspeed) {
			scrollspeed = scrollspeed + acceleration
		} else {
			accelerating = false
			scrollspeed = maxscrollspeed
		}
	}
	
	if(deccelerating) {
		if (scrollspeed > 0) {
			scrollspeed = scrollspeed - decceration
		} else {		
			deccelerating = false
			scrollspeed = 0
			killScroll()
			return
		}
		
		
	
	
	}
	
	
	
	var newPosition = parseInt(dataobj.style.top)+(scrollspeed * direction)
	if ( newPosition < thelength/2*(-1)) {
		newPosition = newPosition + (thelength/2)
	}
	
	if (newPosition>=0) {
	newPosition = newPosition - (thelength/2)
	}
	
	dataobj.style.top=newPosition
	recursiveScroll=setTimeout("scrolltest(" + direction + ")",50)
}
	
	
function stopScroll() {
	accelerating = false
	deccelerating = true
	
		
}

function killScroll() {
	
	if (recursiveScroll){

		clearInterval(recursiveScroll);
		recursiveScroll = null
		deccelerating = false
		scrollspeed = null
		scrolling = false
		currentDirection = null;
	}
		
	
}