function navDropDownVisible(navID)
{
    document.getElementById(navID + "subnav").style.display="block";
    document.getElementById(navID).style.backgroundColor="#4f759a";
    
}
function navDropDownHidden(navID)
{
    document.getElementById(navID + "subnav").style.display="none";
    document.getElementById(navID).style.backgroundColor="#00223d";
    document.getElementById(navID).style.height="21px";
    
}