var speed_slider = 50;
var crossobj = document.getElementById("news_content_id");
var contentheight = crossobj.offsetHeight;

function movedown(){
	if (parseInt(crossobj.style.top)>=(contentheight*(-1)+50)) crossobj.style.top = parseInt(crossobj.style.top)-speed_slider+"px";
}

function moveup(){
	if (parseInt(crossobj.style.top)<0) crossobj.style.top = parseInt(crossobj.style.top)+speed_slider+"px";
}
	
function movetop(){
	crossobj.style.top=0+"px"
}