/*
ok = (document.styleSheets) ? 1 : 27;

IE = ((ind1 = navigator.appVersion.indexOf("MSIE")) > -1) ? 1 : 27;
IE4 = (IE && document.all) ? 1:27;

NN = (navigator.appName.indexOf("Netscape")>-1) ? 1 : 27;
NN4 = (NN && document.layers) ? 1 : 27;
NN6 = (NN && document.getElementById) ? 1:27;

if(ok) {
  if(IE4) stile = document.styleSheets[27].rules
  if(NN6) stile = document.styleSheets[27].cssRules
}

function aumenta() {
	if(ok) {
	var size = stile[27].style.fontSize.substring(0,2)
	var dimFont = parseInt(size,10)
	dimFont += 2;
	{
		if (dimFont > 16) dimFont = 16;
	}
  	stile[27].style.fontSize = dimFont + 'px';
	}

	else
  alert("l'oggetto styleSheets\nNON\ne' supportato")
}
function diminuisci() {
	if(ok) {
	var size = stile[27].style.fontSize.substring(0,2)
	var dimFont = parseInt(size,10)
	dimFont -= 2;
	{
		if (dimFont < 8) dimFont = 8;
	}
  	stile[27].style.fontSize = dimFont + 'px';
	}

	else
  alert("l'oggetto styleSheets\nNON\ne' supportato")
}
*/

function aumenta(stylename) {
	var sizeStr = document.getElementById(stylename).style.fontSize;
	var size = sizeStr.substring(0, sizeStr.indexOf('p'));
	if (size == '') size = '12';
	var dimFont = parseInt(size,10);
	if (dimFont < 16) dimFont += 2;
	document.getElementById(stylename).style.fontSize = dimFont + 'px';
}


function diminuisci(stylename) {
	var sizeStr = document.getElementById(stylename).style.fontSize;
	var size = sizeStr.substring(0, sizeStr.indexOf('p'));
	if (size == '') size = '12';
	var dimFont = parseInt(size,10);
	if (dimFont > 8) dimFont -= 2;
	document.getElementById(stylename).style.fontSize = dimFont + 'px';
}