var dmn = 'surreybellringers.org.uk';
var wnd;
var ns = ((navigator.appName == 'Netscape') || (navigator.appName == 'FireFox'));
var ie = (navigator.appName == 'Microsoft Internet Explorer');
var bv;
if (ie)
{ var i = navigator.appVersion.indexOf('MSIE') + 5;
	bv = parseInt(navigator.appVersion.substr(i,1));
}
else
{ bv = parseInt(navigator.appVersion);
}

function emlk(n, d, s, h)
{
	var a = n+'@'+d;
	var t = (s==null)?a:s;
	var m = (h==null)?'Surrey Association':h;
	document.write('<a href="mailto:'+a+'?Subject='+m+'">'+t+'</a>');
}

function emlk2(n, s, h)
{
	var a = n+'@'+dmn;
	var t = (s==null)?a:s;
	var m = (h==null)?'Surrey Association':h;
	document.write('<a href="mailto:'+a+'?Subject='+m+'">'+t+'</a>');
}

function preload(pic) 
{
  var im = new Image();
	im.src = pic;
	return im; 
}

function mover(el)
{
	el.style.cursor = 'pointer';
}

function mout(el)
{
	el.style.cursor = 'auto';
}

function moverTab(el)
{ 
	if (el.className == 'tabs')
	{ el.className = 'tabhs';
	}
	else
	{ el.className = 'tabh';
	}
}

function moutTab(el)
{
	if (el.className == 'tabhs')
	{ el.className = 'tabs';
	}
	else
	{ el.className = 'tab';
	}
}
	
function moverBut(el)
{ 
	if (el.className == 'buts')
	{ el.className = 'buths';
	}
	else
	{ el.className = 'buth';
	}
}

function moutBut(el)
{
	if (el.className == 'buths')
	{ el.className = 'buts';
	}
	else
	{ el.className = 'but';
	}
}

function goPage(url)
{
	location = url;
}

function newWnd(url)
{
  var props = 'dependent=no,width=800,height=560,left=40,top=20,titlebar=yes,status=yes,menubar=yes,toolbar=yes,directories=no,scrollbars=yes,location=yes,resizable=yes';
  wnd=window.open(url, 'ext', props);
	return false;
}

function mapWnd(ref)
{
	var url = 'http://www.streetmap.co.uk/streetmap.dll?'+ref;
  var props = 'dependent=no,width=800,height=560,left=40,top=20,titlebar=yes,status=yes,menubar=yes,toolbar=yes,directories=no,scrollbars=yes,location=no,resizable=yes';
  wnd=window.open(url, 'map', props);
	return false;
}

function popup(id, w, h)
{
	var y;
	var el = document.getElementById(id);
	if (window.innerWidth)
	{ y = window.pageYOffset + 100;
	}
	else
	{ if (document.documentElement)
		{ y = document.documentElement.scrollTop + 100;
		}
		else
		{ y = document.body.scrollTop + 100;
		}
	}
	el.style.top = y+'px';
	el.style.width = w+'px';
	el.style.height = h+'px';
	el.style.visibility = 'visible';
}

function xpop(id)
{
	document.getElementById(id).style.visibility = 'hidden';
}

function pdf()
{
	popup('pdf', 240, 200);
}

function xpdf()
{
	xpop('pdf');
}

// Browser Slide-Show script. With image cross fade effect for those browsers
// that support it.
// Script copyright (C) 2004-2008 www.cryer.co.uk.
// Script is free to use provided this copyright header is included.

var FadeDurationMS=1500;

function SetOpacity(object,opacityPct)
{
  // IE.
  object.style.filter = 'alpha(opacity=' + opacityPct + ')';
  // Old mozilla and firefox
  object.style.MozOpacity = opacityPct/100;
  // Everything else.
  object.style.opacity = opacityPct/100;
}

function ChangeOpacity(id,msDuration,msStart,fromO,toO)
{
  var element=document.getElementById(id);
  var msNow = (new Date()).getTime();
  var opacity = fromO + (toO - fromO) * (msNow - msStart) / msDuration;
  if (opacity>=100)
  {
    SetOpacity(element,100);
    element.timer = undefined;
  }
  else if (opacity<=0)
  {
    SetOpacity(element,0);
    element.timer = undefined;
  }
  else 
  {
    SetOpacity(element,opacity);
    element.timer = window.setTimeout("ChangeOpacity('" + id + "'," + msDuration + "," + msStart + "," + fromO + "," + toO + ")",10);
  }
}

function FadeInImage(foregroundID,newImage,backgroundID)
{
  var foreground=document.getElementById(foregroundID);
  if (foreground.timer) window.clearTimeout(foreground.timer);
  if (backgroundID)
  {
    var background=document.getElementById(backgroundID);
    if (background)
    {
      if (background.src)
      {
        foreground.src = background.src; 
        SetOpacity(foreground,100);
      }
      background.src = newImage;
      background.style.backgroundImage = 'url(' + newImage + ')';
      background.style.backgroundRepeat = 'no-repeat';
      var startMS = (new Date()).getTime();
      foreground.timer = window.setTimeout("ChangeOpacity('" + foregroundID + "'," + FadeDurationMS + "," + startMS + ",100,0)",10);
    }
  } else {
    foreground.src = newImage;
  }
}

var slideCache = new Array();

function RunSlideShow(pictureID,backgroundID,imageFiles,displaySecs)
{
  var imageSeparator = imageFiles.indexOf(";");
  var nextImage = imageFiles.substring(0,imageSeparator);
  FadeInImage(pictureID,nextImage,backgroundID);
  var futureImages = imageFiles.substring(imageSeparator+1,imageFiles.length)+ ';' + nextImage;
  setTimeout("RunSlideShow('"+pictureID+"','"+backgroundID+"','"+futureImages+"',"+displaySecs+")",displaySecs*1000);
  // Cache the next image to improve performance.
  imageSeparator = futureImages.indexOf(";");
  nextImage = futureImages.substring(0,imageSeparator);
  if (slideCache[nextImage] == null)
  {
    slideCache[nextImage] = new Image;
    slideCache[nextImage].src = nextImage;
  }
}