function dropdown(id){
 
 /** Avataan välilehti **/
 if(document.getElementById('dropdown_'+id).style.display == "none"){
  
  document.getElementById('dropdown_'+id).style.display = "block";
  document.getElementById('dropdown_'+id+'_image').src = "logos/read_more_open.gif";


 /** Suljetaan välilehti **/
 }else{
  document.getElementById('dropdown_'+id).style.display = "none";
  document.getElementById('dropdown_'+id+'_image').src = "logos/read_more.gif";
 }
}