function prepareFontVariables() {
   clickIndex = 1;
   clickFonts = $H({0:1.0,1:1.2,2:1.4});
  

  fontLink = $$('a.change_font');
  elem_to_change_font = $$('div.show_content').first(); 
}

function changeOnClick1(event){
  var size = clickFonts.get(clickIndex);

  elem_to_change_font.setStyle({
    fontSize: size+"em"
  });

  clickIndex += 1;
  if(clickIndex > 2) clickIndex = 0;

  event.stop();
}



function initFontChange(){
  prepareFontVariables();
  
  fontLink.each(function(link){
    link.observe('click',changeOnClick1)
  });
}

document.observe('dom:loaded',initFontChange);