var ssize = 4;
var scrollInterval = 20;
var contentId = 'scrollCopy';
var objContent;
var contentHeight;

function init(){
	var arImg = new Array();
	arImg[0] = new Image();
	arImg[0].src = "_images/common/arrowup_1.gif";
	arImg[1] = new Image();
	arImg[1].src = "_images/common/arrowdown_1.gif";
	objContent = (document.getElementById) ? document.getElementById(contentId) : eval("document.all." + contentId);
	contentHeight = objContent.offsetHeight;
	if(contentHeight > 450){
		document.getElementById('scrollControls').style.display = 'block';
	}
}

function scrollUp(){
	var newtop;
	if(window.scrollDownId){
		clearTimeout(scrollDownId);
	}
	if(parseInt(objContent.style.top) <= 0){
		newtop = parseInt(objContent.style.top) + ssize;
		objContent.style.top = newtop + 'px';
	}
	scrollUpId = setTimeout("scrollUp()",scrollInterval);
}

function scrollDown(){
	var newtop;
	if(window.scrollUpId){
		clearTimeout(scrollUpId);
	}
	if(parseInt(objContent.style.top) >= (contentHeight * (-1) + 450)){
		newtop = parseInt(objContent.style.top) - ssize;
		objContent.style.top = newtop + 'px';
	}
	scrollDownId = setTimeout("scrollDown()",scrollInterval);
}

function stopScroll() {
	if(window.scrollUpId){
		clearTimeout(scrollUpId);
	}
	if(window.scrollDownId){
		clearTimeout(scrollDownId);
	}
}


function swapImage(objId,state){
	var objImage = (document.getElementById) ? document.getElementById(objId) : eval("document." + objId);
	objImage.src = "_images/common/" + objId + "_" + state + ".gif";
}