function showElement(layer){
var myLayer = document.getElementById(layer);
if(myLayer.style.display=="none"){
myLayer.style.display="block";
myLayer.backgroundPosition="top";
} else {
myLayer.style.display="none";
}
}

function hideElement(layer){
var myLayer = document.getElementById(layer);
if(myLayer.style.display!="none"){
myLayer.style.display="none";
myLayer.backgroundPosition="bottom";
} else {
myLayer.style.display="none";
}
}

function prepElement(layer){
var myLayer = document.getElementById(layer);
if(myLayer.style.display!="block"){
myLayer.style.display="block";
myLayer.backgroundPosition="top";
} else {
myLayer.style.display="none";
}
}

function changeElement(layer){
var myLayer = document.getElementById(layer);
if(myLayer.className== "submenutxt"){
myLayer.className= "submenuselect";
myLayer.backgroundPosition= "top";
} else {
myLayer.className= "submenuselect" ;
}
}