var fadetime=1;
var fadetime_1=0.75;
var fadetime_2=0.5;
var fadetime_casestudies=0.5;
var fadetime_cat=0.5;
var current_cat = null;
function show_menu(){
  Effect.toggle('nav','slide', {duration: fadetime});
}
function show_menu_1(){
  if($('subnav_2').visible()){
    window.setTimeout("Effect.toggle('subnav_1','slide', {duration: fadetime_1});",fadetime_1*1000);
    Effect.SlideUp('subnav_2', {duration: fadetime_1});
  }else{
    Effect.toggle('subnav_1','slide', {duration: fadetime_1});
  }
}
function show_menu_2(){
  if($('subnav_1').visible()){
    window.setTimeout("Effect.toggle('subnav_2','slide', {duration: fadetime_2});",fadetime_2*1000);
    Effect.SlideUp('subnav_1', {duration: fadetime_2});
  }else{
    Effect.toggle('subnav_2','slide', {duration: fadetime_2});
  }
}
function toggle_casestudies(){
    Effect.toggle('casestudies','slide', {duration: fadetime_casestudies});
}
function show_cat(cat){
	if(current_cat){
	 Effect.SlideUp(current_cat, {duration: fadetime_cat});
	 current_cat = cat;
	 window.setTimeout("Effect.toggle(current_cat,'slide', {duration: fadetime_cat});",fadetime_cat*1000);
	}else{
	 current_cat = cat;
	 Effect.toggle(current_cat,'slide', {duration: fadetime_cat});
	}
  
}