iens6=document.all||document.getElementById;
ns4=document.layers;

//specify speed of scroll (greater=faster)
var speed=6;

function movedown(hoogteDiv){
if ((!hoogteDiv) || (hoogteDiv="")) hoogteDiv = hoogteDivTemp;
var hoogteDivTemp = hoogteDiv;
	if (iens6&&parseInt(crossobj.style.top)>=(contentheight*(-1)+contentheightDiv )){
		crossobj.style.top=parseInt(crossobj.style.top)-speed+"px";
		}
		else if (ns4&&crossobj.top>=(contentheight*(-1)+410)){
			crossobj.top-=speed;
		}
movedownvar=setTimeout("movedown()",20)
}

function moveup(){
if (iens6&&parseInt(crossobj.style.top)<0){
	crossobj.style.top=parseInt(crossobj.style.top)+speed+"px";
	}
	else if (ns4&&crossobj.top<=0){
		crossobj.top+=speed;
		}
	moveupvar=setTimeout("moveup()",20)
}


/*
function getcontent_height(){
	if (iens6){
		contentheight=crossobj.offsetHeight;
		}
		else if (ns4){
			document.nscontainer.document.nscontent.visibility="show";}
}
*/

function drawScroll(maxHeight, spaceBetweenButtons){
	var changeSpace = ""
	if ((spaceBetweenButtons!=undefined) || (spaceBetweenButtons!="")) changeSpace = "style=\"margin-top:"+spaceBetweenButtons+"px;\"";
	
	
	if (iens6){
		crossobj=document.getElementById? $("content") : document.all.content;
		contentheight=crossobj.offsetHeight;

		if ((maxHeight == "standaard")||(maxHeight == "")) maxHeight = 144;
		contentheightDiv = maxHeight;

		}
	else if (ns4){
		crossobj=document.nscontainer.document.nscontent;
		contentheight=crossobj.clip.height;
	}

	var scrollHTML = "";
	if (contentheight  > (contentheightDiv + 3)){
		scrollHTML =	"<a href=\"#\" onmouseover=\"moveup()\" onmouseout=\"clearTimeout(moveupvar)\"><img src=\"../media/img/scroll_up.gif\" alt=\"Scroll up\" class=\"scroll_up\" /></a>"+
		"<a href=\"#\" onmouseover=\"movedown()\" onmouseout=\"clearTimeout(movedownvar)\"><img src=\"../media/img/scroll_down.gif\" alt=\"Scoll down\" class=\"scroll_down\" "+changeSpace+" /></a>"
	}else{scrollHTML="&nbsp;";}
	$("scroll").innerHTML = scrollHTML;

}