var scrollspeed=6
cross_scroll = document.getElementById("scroll-overflow");
cross_scroll.style.left = "0px";
actualwidth = document.getElementById("sub_navigation").offsetWidth;
document.getElementById('scroll-content').style.width = screen.width - 50 + "px";
//var menuwidth= screen.width  -50;
//alert(actualwidth)

if(actualwidth >= (screen.width)){
document.getElementById("arrow-left").style.visibility= "visible";
document.getElementById("arrow-right").style.visibility= "visible";
}

function moveleft(){
if (parseInt(cross_scroll.style.left)>(menuwidth-actualwidth)){
cross_scroll.style.left=parseInt(cross_scroll.style.left)-scrollspeed+"px"
}
lefttime=setTimeout("moveleft()",40)
}

function moveright(){
if (parseInt(cross_scroll.style.left)<0){
cross_scroll.style.left=parseInt(cross_scroll.style.left)+scrollspeed+"px"
}
righttime=setTimeout("moveright()",40)
}