function metaphorShow (metaphor, menu) {
  
    if (metaphor == 'mouse') {
      document.getElementById(metaphor).style.backgroundImage    = "url(images/menu_img_" + menu + "_over.png)";
      document.getElementById('phones').style.backgroundImage    = "url(images/menu_img_" + menu + "_over.png)";
      document.getElementById('phones').style.backgroundPosition = "-128px -70px";
      document.getElementById('phones').style.backgroundRepeat   = "no-repeat";
    } else {
      document.getElementById(metaphor).style.backgroundImage = "url(images/menu_img_" + menu + "_over.png)";
    }
  
  }
  
  function metaphorHide (metaphor) {
  
    if (metaphor == 'mouse') {
      document.getElementById(metaphor).style.backgroundImage = "";
      document.getElementById('phones').style.backgroundImage = "";
    } else {
      document.getElementById(metaphor).style.backgroundImage = "";
    }
  
  }
  
  function menuShow (menu) {
    
    if (menu == 'projects1') {
      document.getElementById('phones').style.backgroundImage = "url(images/menu_img_projects_over.png)";
      document.getElementById('phones').style.backgroundPosition = "-128px -70px";
      document.getElementById('phones').style.backgroundRepeat = "no-repeat";
      document.getElementById("menu_projects").style.backgroundImage = "url(images/menu_projects_over.png)";
    } else if (menu == 'projects2') {
      document.getElementById('mouse').style.backgroundImage = "url(images/menu_img_projects_over.png)";
      document.getElementById("menu_projects").style.backgroundImage = "url(images/menu_projects_over.png)";
    } else {
      document.getElementById("menu_" + menu).style.backgroundImage = "url(images/menu_" + menu + "_over.png)";
    }
    
  }
  
  function menuHide (menu) {
  
    if (menu == 'projects1') {
      document.getElementById("menu_projects").style.backgroundImage = "";
      document.getElementById('phones').style.backgroundImage = "";
    } else if (menu == 'projects2') {
    document.getElementById('mouse').style.backgroundImage = "";
      document.getElementById("menu_projects").style.backgroundImage = "";
    } else {
      document.getElementById("menu_" + menu).style.backgroundImage = "";
    }
    
  }