var  currentSize = 100;
var headerSize = 140;
var mainSize = 90;

function setFontSize(ev, percentage, prevent)
{
    if (document.getElementsByTagName) {
	currentSize = percentage;
	document.getElementsByTagName("body")[0].style.fontSize = currentSize + '%';

	}
}


function decreaseFontSize(ev)
{
    //setFontSize(ev, currentSize / 1.13, true);
	newSize = headerSize / 1.13;
	headerText = document.getElementById('header');
	headerText.style.fontSize = newSize + "%";
	headerSize = newSize;
	newMain = mainSize / 1.13;
	mainText = document.getElementById('maintext');
	mainText.style.fontSize = newMain + '%';
	mainSize = newMain;
}


function defaultFontSize(ev)
{
    setFontSize(ev, 100, true);
}


function increaseFontSize(ev)
{
    //setFontSize(ev, currentSize * 1.13, true);
	newSize = headerSize * 1.13;
	headerText = document.getElementById('header');
	headerText.style.fontSize = newSize + "%";
	headerSize = newSize;
	newMain = mainSize * 1.13;
	mainText = document.getElementById('maintext');
	mainText.style.fontSize = newMain + '%';
	mainSize = newMain;
}