function GetXmlHttpObject() {
	var xmlHttp=null;
	try {
		// Firefox, Opera 8.0+, Safari
		xmlHttp=new XMLHttpRequest();
	}
	catch (e)
	{
		// Internet Explorer
		try
		{
			xmlHttp=new ActiveXObject("Msxml2.XMLHTTP");
		}
		catch (e)
		{
			xmlHttp=new ActiveXObject("Microsoft.XMLHTTP");
		}
	}
	return xmlHttp;
}

function checkoptions(someform) {
	if (typeof(someform.optionname)=='object') {
		if (someform.myoption.selectedIndex==0) {
			alert('Please select a ' + someform.optionname.value);
			return false;
		} else {
			return true;
		}		
	} else {
		return true;
	}
}

function checkringsize(someform) {
	if (typeof(someform.optionname)=='object') {
		if ( document.getElementById('OtherSize').value=='' && document.getElementById('myoption').options[document.getElementById('myoption').selectedIndex].value=='Other Size' ) {
			alert("Please provide a ring size");
			return false;
		}
	}
}

function openLiveZoom (productcode)
{
	liveZoomWin=window.open('/content/zoom/zoom2.asp?pid='+productcode,'liveZoomWindow','width=450,height=600,location=no,toolbars=no,scrollbars=no,resize=no,status=yes');
	liveZoomWin.focus();
}

function ecsearchgroup(thegroupid) {
	if (document.getElementById(thegroupid).style.display=='none') {
		document.getElementById(thegroupid).style.display='';
		document.getElementById(thegroupid+'_img').src='/images/arrow_down.gif';	
	} else {
		document.getElementById(thegroupid).style.display='none';
		document.getElementById(thegroupid+'_img').src='/images/arrow_in.gif';
	}
	var cookiename=thegroupid
	var cookievalue=(document.getElementById(thegroupid).style.display=='');
	document.cookie=cookiename+"="+cookievalue;

}

function popup(url, width, height)
{
	newwindow=window.open(url,'name','height='+height+',width='+width+',scrollbars=yes,resizable=yes');
	if (window.focus) {newwindow.focus()}
}

function glossarypopup(url, width, height)
{
	newwindow=window.open(url,'name','height='+height+',width='+width+',scrollbars=yes,resizable=no');
	if (window.focus) {newwindow.focus()}
}

// switch styles

function setActiveStyleSheet(title) {
  var i, a, main;
  for (i=0; (a = document.getElementsByTagName("link")[i]); i++) {
    if (a.getAttribute("rel") &&
        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") &&
        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") &&
        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);