function criarcookie(nome,valor,dias) 
{
	if (dias) {
		var date = new Date();
		date.setTime(date.getTime()+(dias*24*60*60*1000));
		var expires = "; expires="+date.toGMTString();
	}
	else var expires = "";
	document.cookie = nome+"="+valor+expires+"; path=/";
}

function lercookie(nome) 
{
	var nameEQ = nome + "=";
	var ca = document.cookie.split(';');
	for(var i=0;i < ca.length;i++) {
		var c = ca[i];
		while (c.charAt(0)==' ') c = c.substring(1,c.length);
		if (c.indexOf(nameEQ) == 0) return c.substring(nameEQ.length,c.length);
	}
	return null;
}

function ligar_som()
{
	var bkgrd=document.getElementById("music");
		criarcookie('som',1,0);
		bkgrd.volume=0;		
}
function desligar_som()
{
	var bkgrd=document.getElementById("music");
		criarcookie('som',2,0);
		bkgrd.volume=-10000;		
}


function verificar_som()
{
	var bkgrd=document.getElementById("music");
	var som=lercookie('som');
	if(som==2)
	{
		bkgrd.volume=-10000;
	}
	else
	{	
		bkgrd.volume.volume=0;
	}
}