function movedown(addicional_speed){
if (iens6&&parseInt(crossobj.style.top)>=(contentheight*(-1)+200))
crossobj.style.top=parseInt(crossobj.style.top)-speed+"px"
else if (ns4&&crossobj.top>=(contentheight*(-1)+100))
crossobj.top-=speed-addicional_speed;
movedownvar=setTimeout("movedown("+addicional_speed+")",20)
}

function moveup(addicional_speed){
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+addicional_speed;
moveupvar=setTimeout("moveup()",20)

}

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