// JavaScript Document

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;
		 
		 // if high contrast css, change logo and viewing option graphics to fit black bg
		 if(title=='contrast') {
		 	//showLogo('images/logo_csa_en_bk.gif');
			//showViewOpt('images/textsizes_en_bk.gif');
		 }
		 else {
		 	//showLogo('images/logo_csa_en_wh.gif');
			//showViewOpt('images/textsizes_en_wh.gif');
		 }
		 // end
     }
   }
}

// return the current style sheet
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 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;
}

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;
}

// change logo for black bg
/*function showLogo(which) {
	var locationLogo = document.getElementById('logo1');
	locationLogo.setAttribute('src',which);
}*/
// end

// change logo for black bg
/*function showViewOpt(which) {
	var locationViewOpt = document.getElementById('viewopt');
	locationViewOpt.setAttribute('src',which);
}*/
// end





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

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