// SWITCH STYLE & ENLARGE TYPE --------------------------------------------------------------

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);



// SWITCH MASTHEAD IMAGE --------------------------------------------------------------

window.onload = choosePic;

var myPix = new Array("http://www.grove-marketing.com/client/NBS/site/global/images/layout/masthead_image_001.gif","http://www.grove-marketing.com/client/NBS/site/global/images/layout/masthead_image_002.gif","http://www.grove-marketing.com/client/NBS/site/global/images/layout/masthead_image_003.gif");

function choosePic() {
	randomNum = Math.floor((Math.random() * myPix.length));
	document.getElementById("mastheadImage").src = myPix[randomNum];
}





// CHANGE TEXT SIZE --------------------------------------------------------------

/*

var currentTextSize = null;
var currentLineHeight = null;
// check for cookie
if (get_text_cookie("coinbooksfontsize")) {
    currentTextSize = parseInt(get_text_cookie("coinbooksfontsize"));
} else {
    currentTextSize = 13;
    createCookie("coinbooksfontsize",currentTextSize,1000);
}
currentLineHeight = currentTextSize + 5;

// creates a cookie with the given parameters
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 {
                var expires = "";
        }
        document.cookie = name + "=" + value + expires + "; path=/";
}

function textSize(dir) {
    if (dir == 'up') {
        if (currentTextSize <= 17) {
            currentTextSize += 2;
        }
    } else if (dir == 'down') {
        if (currentTextSize >= 11) {
            currentTextSize -= 2;
        }
    }
    currentLineHeight = currentTextSize + 5;
	
	
   document.getElementById('content').style.fontSize = currentTextSize + 'px';
   document.getElementById('content').style.lineHeight = currentLineHeight + 'px';
	
	
    // write/rewrite cookie
    createCookie("coinbooksfontsize",currentTextSize,1000);
}

function get_text_cookie ( cookie_name )
{
  var results = document.cookie.match ( cookie_name + '=(.*?)(;|$)' );

  if ( results ) {
    return ( unescape ( results[1] ) );
  }
  else { return null; }
}

*/