var min=62.5;
var max=92;
function increaseFontSize() {
   var b = document.getElementsByTagName('body');
   for(i=0;i<b.length;i++) {
      if(b[i].style.fontSize) {
         var s = parseInt(b[i].style.fontSize.replace("%",""));
      } else {
         var s = 62.5;
      }
      if(s<max) {
         s += 15;
      }
      b[i].style.fontSize = s+"%"
	  
	  	 if(s<63) {
			setActiveStyleSheet('A');	
		}
		
		if(s<78 && s>63) {
			setActiveStyleSheet('A+');	
		}
		
		if(s>78) {
			setActiveStyleSheet('A++');	
		}
	  
	  
   }
}
function decreaseFontSize() {
   var b = document.getElementsByTagName('body');
   for(i=0;i<b.length;i++) {
      if(b[i].style.fontSize) {
         var s = parseInt(b[i].style.fontSize.replace("%",""));
      } else {
         var s = 62.5;
      }
      if(s>min) {
         s -= 15;
      }
      b[i].style.fontSize = s+"%"
	  
	  if(s<63) {
			setActiveStyleSheet('A');	
		}
		
		if(s<78 && s>63) {
			setActiveStyleSheet('A+');	
		}
		
		if(s>78) {
			setActiveStyleSheet('A++');	
		}
   }   
}




/*** switch style sheets ***/

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);