function ep_popup(id){
   if( document.getElementById(id).style.display != "block" ){
     document.getElementById(id).style.display="block";
  }else{
     document.getElementById(id).style.display="none";
   }
  }

 function hover1(id){
   if( document.getElementById(id).className != "button1h" ){
     document.getElementById(id).className="button1h";
  }else{
     document.getElementById(id).className="button1";
   }
 }

 function hover2(id){
   if( document.getElementById(id).className != "button2h" ){
     document.getElementById(id).className="button2h";
  }else{
     document.getElementById(id).className="button2";
   }
 }

 function hover3(id){
   if( document.getElementById(id).className != "button3h" ){
     document.getElementById(id).className="button3h";
  }else{
     document.getElementById(id).className="button3";
   }
 }

 function hover4(id){
   if( document.getElementById(id).className != "button4h" ){
     document.getElementById(id).className="button4h";
  }else{
     document.getElementById(id).className="button4";
   }
 }