// Image preload code

if (document.images)
    {
    var imgbends = new Image();
    imgbends.src = "images/home-bends.jpg";
    var imgtees = new Image();
    imgtees.src = "images/home-tees.jpg";
    var imgybranches = new Image();
    imgybranches.src = "images/home-ybranches.jpg";
    var imgcrucifix = new Image();
    imgcrucifix.src = "images/home-crucifix.jpg";
    var imgstubs = new Image();
    imgstubs.src = "images/home-stubs.jpg";
    var imgreducers = new Image();
    imgreducers.src = "images/home-reducers.jpg";
    var imgbespokefabrications = new Image();
    imgbespokefabrications.src = "images/home-bespoke.jpg";
    }

// Rollover homepage code

function changeCategory(page, title)
    {
    if (document.images && document.anchors)
        {
        var urlString = "/pages/";
        document.images.imgHomeCol3Row2.src = eval("img" + page.replace("-","") + ".src");
        document.getElementById('aHomeCol3Row2').lastChild.data = title;
        document.getElementById('aHomeCol3Row2').setAttribute('href', urlString + page + '/');
        document.getElementById('aImgHomeCol3Row2').setAttribute('href', urlString + page + '/');
        }
    }

// news scroller

var scrollspeed=cache=2
var initialdelay=2000

function initializeScroller()
    {
    dataobj=document.all? document.all.divNewsScroller : document.getElementById("divNewsScroller")
    dataobj.style.marginTop="0"
    setTimeout("getdataheight()", initialdelay)
    }

function getdataheight()
    {
    thelength=dataobj.offsetHeight
    if (thelength==0)
        {
        setTimeout("getdataheight()",200)
        }
    else
        {
        scrollDiv()
        }
    }

function scrollDiv()
    {
    dataobj.style.marginTop=parseInt(dataobj.style.marginTop)-scrollspeed+"px"
    if (parseInt(dataobj.style.marginTop)<thelength*(-1))
        {
        dataobj.style.marginTop="0"
        }
    setTimeout("scrollDiv()",200)
    }

if (window.addEventListener)
    {
    window.addEventListener("load", initializeScroller, false)
    }
else if (window.attachEvent)
    {
    window.attachEvent("onload", initializeScroller)
    }
else
    {
    window.onload=initializeScroller
    }


// drop-down menu code (to help out poor old IE)

sfHover = function() {
    var sfEls = document.getElementById("ulNavBar").getElementsByTagName("li");
    for (var i=0; i<sfEls.length; i++) {
	    sfEls[i].onmouseover=function() {
		    this.className+=" sfhover";
	    }
	    sfEls[i].onmouseout=function() {
		    this.className=this.className.replace(new RegExp(" sfhover\\b"), "");
	    }
    }
}

if (window.attachEvent) window.attachEvent("onload", sfHover);

// functions for accessibility stylesheet swapping

function setActiveStyleSheet(title) {
  var i, a, main;
  for(i=0; (a = document.getElementsByTagName("link")[i]); i++) {
    if(a.getAttribute("rel").indexOf("style") != -1 && a.getAttribute("title")) {
      a.disabled = true;
      if(a.getAttribute("title") == title) a.disabled = false;
    }
  }
}

function getActiveStyleSheet() {
  var i, a;
  for(i=0; (a = document.getElementsByTagName("link")[i]); i++) {
    if(a.getAttribute("rel").indexOf("style") != -1 && a.getAttribute("title") && !a.disabled) return a.getAttribute("title");
  }
  return null;
}

function getPreferredStyleSheet() {
  var i, a;
  for(i=0; (a = document.getElementsByTagName("link")[i]); i++) {
    if(a.getAttribute("rel").indexOf("style") != -1
       && a.getAttribute("rel").indexOf("alt") == -1
       && a.getAttribute("title")
       ) return a.getAttribute("title");
  }
  return null;
}

function createCookie(name,value,days) {
  if (days) {
    var date = new Date();
    date.setTime(date.getTime()+(days*24*60*60*1000));
    var expires = "; expires="+date.toGMTString();
  }
  else expires = "";
  document.cookie = name+"="+value+expires+"; path=/";
}

function readCookie(name) {
  var nameEQ = name + "=";
  var ca = document.cookie.split(';');
  for(var i=0;i < ca.length;i++) {
    var c = ca[i];
    while (c.charAt(0)==' ') c = c.substring(1,c.length);
    if (c.indexOf(nameEQ) == 0) return c.substring(nameEQ.length,c.length);
  }
  return null;
}

window.onload = function(e) {
  var cookie = readCookie("style");
  var title = cookie ? cookie : getPreferredStyleSheet();
  setActiveStyleSheet(title);
}

window.onunload = function(e) {
  var title = getActiveStyleSheet();
  createCookie("style", title, 365);
}

var cookie = readCookie("style");
var title = cookie ? cookie : getPreferredStyleSheet();
setActiveStyleSheet(title);