function clearDefault(field) {
  if (field.defaultValue==field.value) field.value = ""
}

function hide(id) {
	el = document.getElementById(id);
	el.style.display = 'none';
}

function show(id) {
	hide('nav1');
	hide('nav2');
	hide('nav3');
	hide('nav4');
	
	el = document.getElementById(id);
	el.style.display = "block";
	
}

function outputFlash(id,file,width,height) {
    document.getElementById(id).innerHTML = "<object type='application/x-shockwave-flash' data='image/flash/" + file + ".swf' width='" + width + "' height='" + height + "' id='homeSWF'><param name='movie' value='image/flash/" + file + ".swf' /><param name='movie' value='image/flash/" + file + ".swf' /><param name='loop' value='false' /><param name='wmode' value='opaque' />alt : <a href='image/flash/" + file + ".swf'>" + file + ".swf</a></object>";
}