var downloads_t;
var downloads_tagId;
function downloads_moveLeft(){
    tbl = document.getElementById(downloads_tagId);

    x = tbl.style.left;
    x = x.replace('px','');
    
    w = tbl.style.width;
    w = w.replace('px','');

    if(1 * x <= 700 - w){
        clearInterval(downloads_t);
        return;
    }
    x = 1 * (x - 50);
    tbl.style.left = x + "px";

    clearInterval(downloads_t);
    downloads_t = setInterval("downloads_moveLeft()", (Math.abs(1 * x)%(700) == 0)?500:100);

}

function downloads_moveRight(){
    tbl = document.getElementById(downloads_tagId);
    x = tbl.style.left;
    x = x.replace('px','');

    w = tbl.style.width;
    w = w.replace('px','');

    if(1 * x >= 0){
        clearInterval(downloads_t);
        return;
    }

    x = 1 * x + 50;
    tbl.style.left = x + "px";
    clearInterval(downloads_t);
    downloads_t = setInterval("downloads_moveRight()", (Math.abs(1 * x)%(700) == 0)?500:100);
}

function downloads_move(tagId, d){

    downloads_tagId = tagId;
    if(d == -1){
        downloads_moveLeft();
    }else{
        downloads_moveRight();
    }
}