var minFS = 10;
var maxFS = 18;
var normFS = 11;
var normLH = 16;
function increaseFontSize() {
   var p = document.getElementById("content");
	  if(p.style.fontSize) {
		 var s = parseInt(p.style.fontSize.replace("px",""));
		 var l = parseInt(p.style.lineHeight.replace("px",""));
	  } else {
		 var s = 11;
		 var l = 16;
	  }
	  if(s!=maxFS) {
		 s += 1;
		 l += 1;
	  }
	  p.style.fontSize = s+"px";
	  p.style.lineHeight = l+"px";
	  //alert(p.style.fontSize)
}
function decreaseFontSize() {
   var p = document.getElementById("content");
	  if(p.style.fontSize) {
		 var s = parseInt(p.style.fontSize.replace("px",""));
		 var l = parseInt(p.style.lineHeight.replace("px",""));
	  } else {
		 var s = 11;
		 var l = 16;
	  }
	  if(s!=minFS) {
		 s -= 1;
		 l -= 1;
	  }
	  p.style.fontSize = s+"px";
	  p.style.lineHeight = l+"px";
}
function setNormalFontSize() {
   var p = document.getElementById("content");
	p.style.fontSize = normFS+"px";
	p.style.lineHeight = normLH+"px";
}