function hide(nodeId)
{
    var node = document.getElementById(nodeId);
    if (node)
    {
        node.style.display = 'none';
    } 
}
 
function show(nodeId)
{
    var node = document.getElementById(nodeId);
    if (node)
    {
        node.style.display = 'block';
    } 
}



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";
}
}