function update_curr_pic(new_url,sx,sy)
{
    document.images['curr_pic'].title = sx + 'x' + sy;
    document.images['curr_pic'].width = sx;
    document.images['curr_pic'].height = sy;
    document.images['curr_pic'].onload = function(){
        document.images['curr_pic'].src=new_url;
        document.images['curr_pic'].onload=function(){};
        };
    document.images['curr_pic'].src='/site_media/blank.png';
}