//preload menu buttons
function ButtonLoad () {
	var myimages = new Array();
	function preloading(){
		for (x=0; x<preloading.arguments.length; x++){
			myimages[x] = new Image();
			myimages[x].src = preloading.arguments[x];
		}
	}
	preloading("images/bf-home.jpg","images/bf-port.jpg","images/bf-mock.jpg","images/bf-price.jpg","images/bf-about.jpg","images/bf-contact.jpg");
}

//unfold mail function
// by http://www.netlobo.com/div_hiding.html
function toggleLayer(whichLayer)
{
if (document.getElementById)
{
// this is the way the standards work
var style2 = document.getElementById(whichLayer).style;
style2.display = style2.display? "":"block";
}
else if (document.all)
{
// this is the way old msie versions work
var style2 = document.all[whichLayer].style;
style2.display = style2.display? "":"block";
}
else if (document.layers)
{
// this is the way nn4 works
var style2 = document.layers[whichLayer].style;
style2.display = style2.display? "":"block";
}
}

//fold mail messages function
function closeLayer(whichLayer)
{
if (document.getElementById)
{
// this is the way the standards work
var style2 = document.getElementById(whichLayer).style;
style2.display = style2.display? "":"none";
}
else if (document.all)
{
// this is the way old msie versions work
var style2 = document.all[whichLayer].style;
style2.display = style2.display? "":"none";
}
else if (document.layers)
{
// this is the way nn4 works
var style2 = document.layers[whichLayer].style;
style2.display = style2.display? "":"none";
}
}