var oVisible = null;
function changeHeader(event){
    var oWorld = null;
    var oHidden = document.getElementById("divGeneral");
    if (!event) var event = window.event;
    oWorld = (event.target) ? event.target : event.srcElement;
    if (oWorld != null) {
        var idElement = oWorld.id;
        if (idElement != "" ){
            if (oVisible != null){
                oVisible.style.display = "none";
                oHidden.style.display = "block";
            }
            oVisible = document.getElementById("div" + idElement);
            if (oVisible != null && oHidden != null){
                oHidden.style.display = "none";
                oVisible.style.display = "block";
            }
        }
        else{
            if (oHidden != null)
                oHidden.style.display = "block";
             if (oVisible != null){
                oVisible.style.display = "none";
            }
        }  
    }  
}