/*
	displays enlarged images onmouseover small image

*/

// track browser
var bName = navigator.appName;
var bVer = parseInt(navigator.appVersion);
var NS6 = (bName == "Netscape" && bVer >= 5);
var NS4 = (bName == "Netscape" && bVer >= 4 && bVer < 5);
var IE4 = (bName == "Microsoft Internet Explorer" && bVer >= 4);
var NS3 = (bName == "Netscape" && bVer < 4);
var IE3 = (bName == "Microsoft Internet Explorer" && bVer < 4);
window.onerror = null;
var menuActive = 0
var menuOn = 0
var onLayer
var timeOn = null
 
//	set browser code to be used
if (NS4 || IE4 || NS6) {
	if (navigator.appName == "Netscape" && !document.getElementById){
		layerStyleRef="layer.";
		layerRef="document.layers";
		styleSwitch="";
		layerVis="show";
		layerHid="hide";
	}
	else if (!document.all && document.getElementById) {
		layerStyleRef="layer.style.";
		layerRef="document.getElementById";
		styleSwitch=".style";
		layerVis="visible";
		layerHid="hidden";
	}
	else {
		layerStyleRef="layer.style.";
		layerRef="document.all";
		styleSwitch=".style";
		layerVis="visible";
		layerHid="hidden";
	}
}

// show enlarged image
function shLayer(layerName){
 img = getImage("imgTabs");
 imgs = getImage("imgTabss");
 x = getImagePageLeft(img) + img.width - imgs.width;
 y = getImagePageTop(img);
 menuTop = y + 0 ; // LAYER TOP POSITION
 SerL = x + 0 ; // 'Ser' LAYER LEFT POSITION
 ProL = x + 0 ;  // 'Pro' LAYER LEFT POSITION
 RatL = x + 0 ;  // 'Rat' LAYER LEFT POSITION
if (NS4 || IE4 || NS6) {
 if (timeOn != null) {
 hideLayer(onLayer)
 }
 if (NS4 || IE4) {
 eval(layerRef+'["'+layerName+'"]'+styleSwitch+'.visibility="'+layerVis+'"');
 eval(layerRef+'["'+layerName+'"]'+styleSwitch+'.top="'+menuTop+'"');
 eval(layerRef+'["'+layerName+'"]'+styleSwitch+'.left="'+eval(layerName+'L')+'"');
 } 
 if (NS6) {
 eval(layerRef+'("'+layerName+'")'+styleSwitch+'.visibility="'+layerVis+'"');
 eval(layerRef+'("'+layerName+'")'+styleSwitch+'.top="'+menuTop+'"');
 eval(layerRef+'("'+layerName+'")'+styleSwitch+'.left="'+eval(layerName+'L')+'"');
 } 
 onLayer = layerName
 }
}

// hide enlarged image
function hideLayer(layerName)
{
	if (NS4 || IE4) 
		eval(layerRef+'["'+layerName+'"]'+styleSwitch+'.visibility="'+layerHid+'"');
	if (NS6)
		eval(layerRef+'("'+layerName+'")'+styleSwitch+'.visibility="'+layerHid+'"');
}


function getImage(name) {
  if (NS4 || NS6)
    return findImage(name, document);
  if (IE4 || NS6)
    return eval('document.all.' + name);
  return null;
}

// retrieves image to be enlarged
function findImage(name, doc) {
  var i, img;
  for (i = 0; i < doc.images.length; i++)
    if (doc.images[i].name == name)
      return doc.images[i];
  for (i = 0; i < doc.layers.length; i++)
    if ((img = findImage(name, doc.layers[i].document)) != null) {
      img.container = doc.layers[i];
      return img;
    }
  return null;
}

// checks distance of the small image from the left side of the screen
function getImagePageLeft(img) {
  var x, obj;
  if (NS4 || NS6) {
    if (img.container != null)
      return img.container.pageX + img.x;
    else
      return img.x;
  }
  if (IE4) {
    x = 0;
    obj = img;
    while (obj.offsetParent != null) {
      x += obj.offsetLeft;
      obj = obj.offsetParent;
    }
    x += obj.offsetLeft;
    return x;
  }
  return -1;
}

// checks distance of the small image from the top of the screen
function getImagePageTop(img) {
  var y, obj;
  if (NS4 || NS6) {
    if (img.container != null)
      return img.container.pageY + img.y;
    else
      return img.y;
  }
  if (IE4) {
    y = 0;
    obj = img;
    while (obj.offsetParent != null) {
      y += obj.offsetTop;
      obj = obj.offsetParent;
    }
    y += obj.offsetTop;
    return y;
  }
  return -1;
}