var speed = 100
var distance = 5
var objheight, moveok
var nonIEOffset = 15
if (document.all) {nonIEOffset=0}
function movecontent(uord,objName) {
  if (document.getElementById(objName).offsetHeight>objheight) {
    if (uord=="down") {d=distance*-1} else {d=distance}
    moveok = setInterval("moveobj("+d+",'"+objName+"')",speed)
  }
}
function moveobj(dis,objName) {
  if ((dis>0)&&(parseInt(document.getElementById(objName).style.top)>(0-dis))) {
    document.getElementById(objName).style.top = 0
    clearInterval(moveok)
  } else if ((dis<0)&&(parseInt(document.getElementById(objName).style.top)<(objheight-dis-parseInt(document.getElementById(objName).offsetHeight)))) {
    document.getElementById(objName).style.top = objheight-(parseInt(document.getElementById(objName).offsetHeight))
    clearInterval(moveok)
  } else {
    document.getElementById(objName).style.top = (parseInt(document.getElementById(objName).style.top) + dis) + "px"
  }
}