window.onload = function() {
	var letterSizePerc = 62.5;
	var styleSheetSelected = 'print';

	document.getElementById('letterSize').onclick = function() {
		letterSizePerc = (letterSizePerc == 62.5) ? 75 : 62.5;
		document.body.style.fontSize = letterSizePerc +'%';
	}

	document.getElementById('printVersion').onclick = function() {
  		var i, styleSheets, main;
  		for (i = 0; (styleSheet = document.getElementsByTagName("link")[i]); i++) {
    		if (styleSheet.getAttribute("rel").indexOf("style") != -1 && styleSheet.getAttribute("title")) {
      		styleSheet.disabled = true;
      		if (styleSheet.getAttribute("title") == styleSheetSelected) {
      			styleSheet.disabled = false;
      		}
    		}
  		}
		styleSheetSelected = (styleSheetSelected == 'print') ? 'default' : 'print';
	}
}