var min=8;
var max=18;
function increaseFontSize() {
   var p = document.getElementsByTagName('p');
   var size = '';
   for(i=0;i<p.length;i++) {
      if(p[i].style.fontSize) {
         var s = parseInt(p[i].style.fontSize.replace("pt",""));
      } else {
         var s = 12;
      }
      if(s!=max) {
         s += 1;
      }

      size = s+"pt";
	  p[i].style.fontSize = size;
   }

   saveFontSizePreferences(size);
}

function decreaseFontSize() {
   var p = document.getElementsByTagName('p');
   size = '';
   for(i=0;i<p.length;i++) {
      if(p[i].style.fontSize) {
         var s = parseInt(p[i].style.fontSize.replace("pt",""));
      } else {
         var s = 12;
      }
      if(s!=min) {
         s -= 1;
      }

	  size = s+"pt";
      p[i].style.fontSize = size;
   }

   saveFontSizePreferences(size);
}

function setFontSize() {
   var p = document.getElementsByTagName('p');
   size = loadFontSizePreferences();
   for(i=0;i<p.length;i++) {
      p[i].style.fontSize = size;
   }
}

function saveFontSizePreferences(size) {
		 createCookie('ftekfontSizePreferences', size, 1);
}

function loadFontSizePreferences() {
	return readCookie('ftekfontSizePreferences');
}

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 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;
}