function toggle_visibility_big(id,id2) {
	var e = document.getElementById(id);
   if(e.style.display == 'block'){
	  e.style.display = 'none'; 
	  document.getElementById(id2).src ='_modules/pics/arrow_big1.gif';
   }
   else{
	  e.style.display = 'block';
	  document.getElementById(id2).src ='_modules/pics/arrow_big2.gif';
	}
}

function toggle_visibility(id,id2) {
   var e = document.getElementById(id);
   if(e.style.display == 'block'){
	  e.style.display = 'none'; 
	  document.getElementById(id2).src ='_modules/pics/arrow1.gif';
   }
   else{
	  e.style.display = 'block';
	  document.getElementById(id2).src ='_modules/pics/arrow2.gif';
	}
}


function toggle_visibility_simple(id) {
   var e = document.getElementById(id);
   if(e.style.display == 'block'){
	  e.style.display = 'none'; 
   }
   else{
	  e.style.display = 'block';
	}
}