var min=11;
var max1=14;
var max2=18
function increaseFontSize(x) {
   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 = 11;
      }
		if (x == 1) {
			s = max1;
		}
		if (x == 2) {
			s = max2;
		}
		if (x == 0) {
			s = min;
		}
		if ((p[i].className != 'blue')&&(p[i].className != 'speach')) {
			p[i].style.fontSize = s+"px"
		}

   }
}