function show(block_id,elementType)
{
    if ( elementType == null ) {
        var elementType = 'block';
    }
    var myElement = document.getElementById(block_id);
    if (myElement != null) {
        myElement.style.display = elementType;
    } else {
        alert('Request to show() function failed. Element id undefined = '+ block_id);
    }
}

function hide(block_id)
{
    var myElement = document.getElementById(block_id);
    if (myElement != null) {
        myElement.style.display = 'none';
    } else {
        alert('Request to hide() function failed. Element id undefined = ' + block_id);
    }

    //    document.getElementById(block_id).style.display = 'none';
}

var state = 'none';
function showhide(layer_ref){
if(state == 'block'){
state = 'none';
}else{
state = 'block';
}
if(document.all){ //IS IE 4 or 5 (or 6 beta)
eval("document.all." +layer_ref+ ".style.display = state");
}
if (document.layers) { //IS NETSCAPE 4 or below
document.layers[layer_ref].display = state;
}
if (document.getElementById &&!document.all) {
hza = document.getElementById(layer_ref);
hza.style.display = state;
}
}