function changeFontSize(sizeDifference) {
	currentFontSize = parseInt(currentFontSize) + parseInt(sizeDifference * 5);
	if(currentFontSize > 100){
		currentFontSize = 100;
	} else if(currentFontSize < 60) {
		currentFontSize = 60;
	}
	setFontSize(currentFontSize);
};

function setFontSize(fontSize) {
	var stObj = (document.getElementById) ? document.getElementById('content_area') : document.all('content_area');
	document.body.style.fontSize = fontSize + '%';
	//alert (document.body.style.fontSize);
};

function onChange(nbPages) {
	document.getElementById('nb_page_s').options[document.getElementById('nb_page_s').selectedIndex].value
}