var min=10;
var max=28;
var netral=14;
function increaseFontSize() {
   var p = document.getElementsByTagName('p');
   for(i=0;i<p.length;i++) {
      if(p[i].style.fontSize) {
         var s = parseInt(p[i].style.fontSize.replace("px",""));
      } else {
         var s =15;
      }
      if(s!=max) {
         s += 1;
      }
      p[i].style.fontSize = s+"px"
   }
}
function decreaseFontSize() {
   var p = document.getElementsByTagName('p');
   for(i=0;i<p.length;i++) {
      if(p[i].style.fontSize) {
         var s = parseInt(p[i].style.fontSize.replace("px",""));
      } else {
         var s = 13;
      }
      if(s!=min) {
         s -= 1;
      }
      p[i].style.fontSize = s+"px"
   }   
}
function resetFontSize() {
   var p = document.getElementsByTagName('p');
   for(i=0;i<p.length;i++) {
      if(p[i].style.fontSize) {
         var s = parseInt(p[i].style.fontSize.replace("px",""));
      } else {
         var s =16;
      }
      if(s!=netral) {
         s = 14;
      }
      p[i].style.fontSize = s+"px"
   }
}

function changeColorBW(){
	document.body.style.background = "#FFFAFA";
	document.getElementById('container').style.background = "#FFFAFA";
	document.getElementById('content').style.color = '#333333';
	document.getElementById('container').style.color = '#333333';
}

function changeColorWB(){
	document.body.style.background = "#000000";
	document.getElementById('container').style.background = "#000000";
	document.getElementById('content').style.color = '#FFFFFF';
	document.getElementById('container').style.color = '#FFFFFF';
}