function camada(id) {
	var obj = null;
	if (document.getElementById) {
		obj = document.getElementById(id);
	} else if (document.all){
		obj = document.all[id];
	} else if (document.layers){
		obj = document.layers[id];
	}
	if (obj.style.display == "none") {
		obj.style.display = "block";
	} else {
		obj.style.display = "none";
	}
}


function click() 
{
	if (event.button==2||event.button==3) 
	{
		oncontextmenu='return false';
	}
}
document.onmousedown=click
document.oncontextmenu = new Function("return false;")