function showMenu(quien){
	if(document.getElementById){
		quien_es = document.getElementById(quien);/*ponemos en la variable quien_es al elemento que buscamos*/
		addClass ( quien_es, "selected" ); 
	}
}

function hideMenu(quien_array){
	for( var i = 0; i < quien_array.length; i++)
	{
		quien_es = document.getElementById( quien_array[i] );
		removeClass ( quien_es, "selected" );
	}
}

function toggleMenu ( quien ){
	quien_es = document.getElementById(quien);
	
	toggleClass ( quien_es, "selected" );
}


function addClass ( object, className )
{
	myClass = object.className;

	myClass += " " + className;


	object.className = myClass;
}

function removeClass ( object, className )
{
	myClass = object.className;

	myClassAry = myClass.split(" ");

	for ( i = 0; i < myClassAry.length; i++)
	{
		if ( myClassAry[i] == className)
			myClassAry.splice(i, 1);
	}
	myClass = myClassAry.join(" "); 

	object.className = myClass;
}

function toggleClass ( object, className )
{
	myClass = object.className;

	myClassAry = myClass.split(" ");

	for ( i = 0; i < myClassAry.length; i++)
	{
		if ( myClassAry[i] == className){
			myClassAry.splice(i, 1);
			myClass = myClassAry.join(" "); 
			object.className = myClass;
			return;
		}
	}
	
	myClassAry[myClassAry.length] = className;
	myClass = myClassAry.join(" "); 
	object.className = myClass;
}