$(function(){
$('input').click(function(){
     var ourText1 = $('p');
     var currFontSize1 = ourText1.css('fontSize');
     var finalNum1     = parseFloat(currFontSize1, 10);
     var stringEnding1 = currFontSize1.slice(-2);

     var ourText2 = $('h1');
     var currFontSize2 = ourText2.css('fontSize');
     var finalNum2     = parseFloat(currFontSize2, 10);
     var stringEnding2 = currFontSize2.slice(-2);

     var ourText3 = $('li');
     var currFontSize3 = ourText3.css('fontSize');
     var finalNum3     = parseFloat(currFontSize3, 10);
     var stringEnding3 = currFontSize3.slice(-2);

     if(this.id == 'large') {
          finalNum1 *= 1.2;
          finalNum2 *= 1.2;
          finalNum3 *= 1.2;
     }
     else if (this.id == 'small') {
          finalNum1 /=1.2;
          finalNum2 /=1.2;
          finalNum3 /=1.2;
     }
     ourText1.animate({fontSize: finalNum1 + stringEnding1},600);
     ourText2.animate({fontSize: finalNum2 + stringEnding2},600);
     ourText3.animate({fontSize: finalNum3 + stringEnding3},600);
     }
);
});