function changeImgMenuDefault(type,obj) {
     switch(type) {
     case "intro":
      obj.style.backgroundImage="url(/images/menu_intro_default.jpg)";
     break;
     
     case "web":
      obj.style.backgroundImage="url(/images/menu_default.jpg)";
     break;
     
     case "intro_sm1":
      document.getElementById(obj).style.backgroundImage="url(/images/menu_intro_default.jpg)";
      document.getElementById("intro_sm1").style.visibility = "hidden";
      document.getElementById("intro_sm1_bg").style.visibility = "hidden";
     break;
     
     case "intro_sm2":
      document.getElementById(obj).style.backgroundImage="url(/images/menu_intro_default.jpg)";
      document.getElementById("intro_sm2").style.visibility = "hidden";
      document.getElementById("intro_sm2_bg").style.visibility = "hidden";
     break;
     
     case "web_sm1":
      document.getElementById(obj).style.backgroundImage="url(/images/menu_default.jpg)";
      document.getElementById("web_sm1").style.visibility = "hidden";
      document.getElementById("web_sm1_bg").style.visibility = "hidden";
     break;
     
     case "web_sm2":
      document.getElementById(obj).style.backgroundImage="url(/images/menu_default.jpg)";
      document.getElementById("web_sm2").style.visibility = "hidden";
      document.getElementById("web_sm2_bg").style.visibility = "hidden";
     break;
     }
}

function changeImgMenuOver(type,obj) {
     switch(type) {
     case "intro":
      obj.style.backgroundImage="url(/images/menu_intro_over.jpg)";
     break;
     
     case "web":
      obj.style.backgroundImage="url(/images/menu_over.jpg)";
     break;
     
     case "intro_sm1":
      document.getElementById(obj).style.backgroundImage="url(/images/menu_intro_over.jpg)";
      document.getElementById("intro_sm1").style.visibility = "visible";
      document.getElementById("intro_sm1_bg").style.visibility = "visible";
     break;
     
     case "intro_sm2":
      document.getElementById(obj).style.backgroundImage="url(/images/menu_intro_over.jpg)";
      document.getElementById("intro_sm2").style.visibility = "visible";
      document.getElementById("intro_sm2_bg").style.visibility = "visible";
     break;
     
     case "web_sm1":
      document.getElementById(obj).style.backgroundImage="url(/images/menu_over.jpg)";
      document.getElementById("web_sm1").style.visibility = "visible";
      document.getElementById("web_sm1_bg").style.visibility = "visible";
     break;
     
     case "web_sm2":
      document.getElementById(obj).style.backgroundImage="url(/images/menu_over.jpg)";
      document.getElementById("web_sm2").style.visibility = "visible";
      document.getElementById("web_sm2_bg").style.visibility = "visible";
     break;
     }
}

function changeImgMenuDefaultEn(type,obj) {
     switch(type) {
     case "intro":
      obj.style.backgroundImage="url(/images/menu_intro_default_en.jpg)";
     break;
     
     case "web":
      obj.style.backgroundImage="url(/images/menu_default_en.jpg)";
     break;
     
     case "intro_sm1":
      document.getElementById(obj).style.backgroundImage="url(/images/menu_intro_default_en.jpg)";
      document.getElementById("intro_sm1").style.visibility = "hidden";
      document.getElementById("intro_sm1_bg").style.visibility = "hidden";
     break;
     
     case "intro_sm2":
      document.getElementById(obj).style.backgroundImage="url(/images/menu_intro_default_en.jpg)";
      document.getElementById("intro_sm2").style.visibility = "hidden";
      document.getElementById("intro_sm2_bg").style.visibility = "hidden";
     break;
     
     case "web_sm1":
      document.getElementById(obj).style.backgroundImage="url(/images/menu_default_en.jpg)";
      document.getElementById("web_sm1").style.visibility = "hidden";
      document.getElementById("web_sm1_bg").style.visibility = "hidden";
     break;
     
     case "web_sm2":
      document.getElementById(obj).style.backgroundImage="url(/images/menu_default_en.jpg)";
      document.getElementById("web_sm2").style.visibility = "hidden";
      document.getElementById("web_sm2_bg").style.visibility = "hidden";
     break;
     }
}

function changeImgMenuOverEn(type,obj) {
     switch(type) {
     case "intro":
      obj.style.backgroundImage="url(/images/menu_intro_over_en.jpg)";
     break;
     
     case "web":
      obj.style.backgroundImage="url(/images/menu_over_en.jpg)";
     break;
     
     case "intro_sm1":
      document.getElementById(obj).style.backgroundImage="url(/images/menu_intro_over_en.jpg)";
      document.getElementById("intro_sm1").style.visibility = "visible";
      document.getElementById("intro_sm1_bg").style.visibility = "visible";
     break;
     
     case "intro_sm2":
      document.getElementById(obj).style.backgroundImage="url(/images/menu_intro_over_en.jpg)";
      document.getElementById("intro_sm2").style.visibility = "visible";
      document.getElementById("intro_sm2_bg").style.visibility = "visible";
     break;
     
     case "web_sm1":
      document.getElementById(obj).style.backgroundImage="url(/images/menu_over_en.jpg)";
      document.getElementById("web_sm1").style.visibility = "visible";
      document.getElementById("web_sm1_bg").style.visibility = "visible";
     break;
     
     case "web_sm2":
      document.getElementById(obj).style.backgroundImage="url(/images/menu_over_en.jpg)";
      document.getElementById("web_sm2").style.visibility = "visible";
      document.getElementById("web_sm2_bg").style.visibility = "visible";
     break;
     }
}

function changeOp(obj){
  if(obj.style.opacity==0.8) {
    obj.style.opacity=1;
    obj.style.filter='alpha(opacity=100)';
  }else{
    obj.style.opacity=0.8;
    obj.style.filter='alpha(opacity=80)';
  }  
}