// hide_show.js: contains javascript functions for finding, hiding, and showing objects.

// from http://www.netlobo.com/javascript_get_element_id.html:
function returnObjById( id )
{
    if (document.getElementById)
        var returnVar = document.getElementById(id);
    else if (document.all)
        var returnVar = document.all[id];
    else if (document.layers)
        var returnVar = document.layers[id];
	if (! returnVar) alert("no such object as '" + id + "'")
    return returnVar;
}
// end borrowed code

function hide_obj(obj_id) {
	ob = returnObjById(obj_id);
	if (ob) ob.style.display='none';
}

function show_obj(obj_id) {
	ob = returnObjById(obj_id);
	if (ob) ob.style.display='block';
}