function init(){
	
	document.getElementById("btn_inst").onmouseover = function(){document.getElementById("sub_inst").style.display = 'block';}; 
	document.getElementById("btn_inst").onmouseout = function(){document.getElementById("sub_inst").style.display = 'none';}; 
	document.getElementById("sub_inst").onmouseout = function(){document.getElementById("sub_inst").style.display = 'none';}; 
	document.getElementById("sub_inst").onmouseover = function(){document.getElementById("sub_inst").style.display = 'block';};
	

	document.getElementById("btn_reserv").onmouseover = function(){document.getElementById("sub_reserva").style.display = 'block';}; 
	document.getElementById("btn_reserv").onmouseout = function(){document.getElementById("sub_reserva").style.display = 'none';}; 
	document.getElementById("sub_reserva").onmouseout = function(){document.getElementById("sub_reserva").style.display = 'none';}; 
	document.getElementById("sub_reserva").onmouseover = function(){document.getElementById("sub_reserva").style.display = 'block';};
	

	
	document.getElementById("btn_cadastrese").onmouseover = function(){document.getElementById("sub_cadastrese").style.display = 'block';}; 
	document.getElementById("btn_cadastrese").onmouseout = function(){document.getElementById("sub_cadastrese").style.display = 'none';}; 
	document.getElementById("sub_cadastrese").onmouseout = function(){document.getElementById("sub_cadastrese").style.display = 'none';}; 
	document.getElementById("sub_cadastrese").onmouseover = function(){document.getElementById("sub_cadastrese").style.display = 'block';};
	
}


window.onload=init