<!-- ******************* ON LOAD **************** -->

function alCargarPagina(menu_ids){
	if(menu_ids!="none"){
		var arr_ids=menu_ids.split("*");
		for(var i=0; i<arr_ids.length; i++){
			despliega(arr_ids[i]);
		}
	}
}

<!-- funciones genéricas -->

function ocultamenu(menu_id){
  var menu = document.getElementById(menu_id);
  menu.style.display = "none";
}
function despliega(menu_id){
  var menu = document.getElementById(menu_id);
    if(menu.style.display == "block"){
      menu.style.display = "none";
    }
    else{
      menu.style.display = "block";
    }
}

<!-- ********************************** ADDI ********************************** -->

function ocultamenu_addi(){
  var menu = document.getElementById("addi");
  menu.style.display = "none";
}
function despliega_addi(){
  var menu = document.getElementById("addi");
    if(menu.style.display == "block"){
      menu.style.display = "none";
    }
    else{
      menu.style.display = "block";
    }
}

<!-- ********************************** PRODUCTOS ********************************** -->

function ocultamenu_productos(){
  var menu = document.getElementById("productos");
  menu.style.display = "none";
}
function despliega_productos(){
  var menu = document.getElementById("productos");
    if(menu.style.display == "block"){
      menu.style.display = "none";
    }
    else{
      menu.style.display = "block";
    }
}

<!-- ********************************** PROYECTOS ********************************** -->

function ocultamenu_proyectos(){
  var menu = document.getElementById("proyectos");
  menu.style.display = "none";
}
function despliega_proyectos(){
  var menu = document.getElementById("proyectos");
    if(menu.style.display == "block"){
      menu.style.display = "none";
    }
    else{
      menu.style.display = "block";
    }
}