function preload()
	{
		m1 = new Image(); 
		m1.src = "images/formacao-over.png";
		m2 = new Image(); 
		m2.src = "images/servicos-over.png";
		m3 = new Image(); 
		m3.src = "images/educacao-over.png";
		fundoextra2 = new Image(); 
		fundoextra2.src = "images/fundo-extra2.png";
		fundoextra = new Image(); 
		fundoextra.src = "images/fundo-extra.png";
	}
	
	function muda(nome, src)
	{
		var obj = document.getElementById(nome);
		obj.src = 'images/'+src;
	}