function toggleLayer(id){
	if (document.getElementById){
		obj = document.getElementById(id);
		if (obj.style.display == "none"){
			obj.style.display = "block";
		} else {
			obj.style.display = "none";
		}
	}
}

/*Change the image of a DIV element*/
function changeMinMaxImg(id, img){
	obj = document.getElementById(id);
	if (obj.style.display == "none")
	{
		document.getElementById(img).src='/images/menuplus.gif';
	} 
	else
	{
		document.getElementById(img).src='/images/menuminus.gif';
	}
}