function toggleDiv(id,flag)
{
    if (flag=="1" && id=="div4"){
    document.getElementById(''+id+'').style.visibility = "visible"
    document.getElementById("div3").style.visibility = "hidden"
    document.getElementById("div2").style.visibility = "hidden"
    document.getElementById("gt-mag").style.visibility = "hidden"
    }
    if (flag=="1" && id=="div3"){
    document.getElementById("div4").style.visibility = "hidden"
    document.getElementById(''+id+'').style.visibility = "visible"
    document.getElementById("div2").style.visibility = "hidden"
    document.getElementById("gt-mag").style.visibility = "hidden"
    }
    if (flag=="1" && id=="div2"){
    document.getElementById("div4").style.visibility = "hidden"
    document.getElementById("div3").style.visibility = "hidden"
    document.getElementById(''+id+'').style.visibility = "visible"
    document.getElementById("gt-mag").style.visibility = "hidden"
    }
    if (flag=="1" && id=="gt-mag"){
    document.getElementById("div4").style.visibility = "hidden"
    document.getElementById("div3").style.visibility = "hidden"
    document.getElementById("div2").style.visibility = "hidden"
    document.getElementById(''+id+'').style.visibility = "visible"
    }   
}