function toggle_visibility(id,title_to_focus) 
{
       var e = document.getElementById(id);
       if(e.style.display == 'block')
          e.style.display = 'none';
       else {
          e.style.display = 'block';
    	   if ( title_to_focus != null ) {
          // optional parameter: focus on a given field after showing
          var t = document.getElementById(title_to_focus);
	   t.focus();
          }
	}
}

function setFocus(arg_name)
{
     document.getElementById(arg_name).focus();
}

function setFontBold(arg_name)
{
     var e = document.getElementById(arg_name);
     e.style.fontWeight = 'bold';
}