function popshow(url)
{ x=screen.width-600;
  mapwin=window.open(url,'bertie','width=600,height=350,left='+x+',scrollbars=1,toolbar=0,resizable=1',false);
  mapwin.focus();
}

function filchange(form,but)
{ if (but<2)
  { form.findcountry.selectedIndex=0;
    form.findsubject.selectedIndex=0;
    form.findstring.value="";
    form.findauthor.value="";
    form.submit();
  }
}

function selchange(form)
{ form.filterradio[2].checked=true;
}

function newsfilchange(form,but)
{ if (but<2)
  { form.findcountry.selectedIndex=0;
    form.findsubject.selectedIndex=0;
    form.findstring.value="";
    form.submit();
  }
}

function newselchange(form)
{ form.filterradio[1].checked=true;
}

function showpath()
{ u=document.URL;
  p=u.indexOf('#');
  u=u.substr(p);
  alert(u);
}

function check_email(str)    
{ ereg=new RegExp("^.+@.+\\..+$");
  return ereg.test(str);  
} 

function reveal(id,show) 
{ if (show)
    document.getElementById(id).style.visibility='visible';
  else
    document.getElementById(id).style.visibility='hidden';
}

function postit(form,flag)
{ switch (flag)
  { case 1: form.action="utils/cclpmailer.php"; break;
    default: return;
  }

  form.method="post"

  if (!check_email(form.fromemail.value))
  { if (form.fromemail.value.length)
      alert("There seems to be an error in your e-mail address");
    else
      alert("Please enter your e-mail address");
    form.fromemail.focus();
  }

  else if (form.surname.value.length==0)
  { alert("Please give us your name");
    form.surname.focus();
  }

  else if (form.title.value.length==0)
  { alert("Please enter your title (Mr, Mrs, Professor, etc.)");
    form.title.focus();
  }

  else if (form.message.value.length==0)
  { alert("You have not entered a message");
    form.message.focus();
  }

  else
  { reveal('sendbutton',false);
    reveal('ack',true);
    form.submit(); 
  }

}

function go_top()
{ document.documentElement.scrollTop=0;
  document.body.scrollTop=0;
}

function set_retop()
{ var b=document.documentElement;
  var sbar=(b.scrollHeight > b.clientHeight);
  document.getElementById('return-to-top').style.visibility=(sbar) ? 'visible':'hidden';
}

function hidemenu(menuid)
{ document.getElementById(menuid).style.display = 'none';
}

function showmenu(menuid)
{ document.getElementById(menuid).style.display = 'inline';
}

function findpos(object)
{ var x=y=0;
  if (object.offsetParent)
    do 
    { x+=object.offsetLeft;
      y+=object.offsetTop;
    } while (object=object.offsetParent);
  return [x,y];
}

function hidepop(form)
{ document.getElementById('popthumb').style.visibility = 'hidden';
}

function showpop(form,sender,img)
{ pos=findpos(sender);

  ob=document.getElementById('popthumb');
  ob.style.visibility = 'visible';

// xs=window.getComputedStyle(ob,null).left;
// ys=window.getComputedStyle(ob,null).top;
// alert(xs+', '+ys);

  var x=pos[0]+420+sender.width;
  var y=pos[1]-40;

  ob.style.left=x+'px';
  ob.style.top=y+'px';

  ob.src=img;
  ob.style.zIndex=10;
}

function hideballoon(form)
{ document.getElementById('popballoon').style.visibility='hidden';
  document.getElementById('helptext').style.visibility='hidden';
}

function revealaballoon(form,sender,head,text,balloon_source,height)
{ pos=findpos(sender);

  ob=document.getElementById('popballoon');

  ob.src='pictures/'+balloon_source+'.gif';

  if (ob.style.visibility=='visible')
  { hideballoon(form);
    return;
  }

  var x=pos[0]-ob.width/2-90;
  var y=pos[1]-height;

  ob.style.left=x+'px';
  ob.style.top=y+'px';
  ob.style.visibility='visible';

  obtxt=document.getElementById('helptext');

  obtxt.innerHTML='<h3 class=help>'+head+'</h3>'+text;

  obtxt.style.left=x+20+'px';
  obtxt.style.top=y+15+'px';
  obtxt.style.visibility='visible';

  ob.style.zIndex=10;
  obtxt.style.zIndex=11;
}

function revealballoon(form,sender,head,text)
{ revealaballoon(form,sender,head,text,'popballoon',221);
}

function reveallargeballoon(form,sender,head,text)
{ revealaballoon(form,sender,head,text,'popballoon-large',310);
}

function revealhugeballoon(form,sender,head,text)
{ revealaballoon(form,sender,head,text,'popballoon-huge',460);
}

function revealvastballoon(form,sender,head,text)
{ revealaballoon(form,sender,head,text,'popballoon-vast',700);
}