var speed=2;
var moveupvar;
var movedownvar;

function move_up(speed){
if(parseInt(document.getElementById('corps_text').style.top) > parseInt(document.getElementById('corps').offsetHeight) - parseInt(document.getElementById('corps_text').offsetHeight)){
document.getElementById('corps_text').style.top = parseInt(document.getElementById('corps_text').style.top) - speed + "px";
moveupvar=setTimeout("move_up(speed)",20);
}
}
function move_down(speed){
if(parseInt(document.getElementById('corps_text').style.top) < 0){
document.getElementById('corps_text').style.top = parseInt(document.getElementById('corps_text').style.top) + speed + "px";
movedownvar=setTimeout("move_down(speed)",20);
}
}
function click_up(){
if(parseInt(document.getElementById('corps_text').style.top) > parseInt(document.getElementById('corps').offsetHeight) - parseInt(document.getElementById('corps_text').offsetHeight)){
document.getElementById('corps_text').style.top = parseInt(document.getElementById('corps_text').style.top) - 16 + "px";
}
}
function click_down(){
if(parseInt(document.getElementById('corps_text').style.top) < 0){
document.getElementById('corps_text').style.top = parseInt(document.getElementById('corps_text').style.top) + 16 + "px";
}
}