function setMyDiv(userFile)
{
document.getElementById("content").innerHTML = "<iframe src='"+userFile+"' width=100% height=500 frameborder=0 scrolling=yes>";
}
function goback()
{
history.back();
}

function frame_up() {
    scroll_content.scrollTop = scroll_content.scrollTop + 10;
}
function frame_down() {
    scroll_content.scrollTop = scroll_content.scrollTop - 10;
}