function dimensionetesto(misura) {
    if (!document.getElementsByTagName) return;
    var standard = "s";
    var misure_ = {
	    "xs": "11px",
	    "s": "13px",
	    "m": "15px"
    };
    var filecss = {
        "xs" : "/Temi/AIC-2009/css/testoxs.css",
        "s" : "/Temi/AIC-2009/css/testos.css",
        "m" : "/Temi/AIC-2009/css/testom.css"
        };
    if (!misura) {
	    var cookie = readCookie("dimensionetesto");
	    misura = cookie ? cookie : standard;
	    if(misura == standard)
	        return;
    }
    setCSS(filecss[misura]);
    document.getElementById("font-xs").style.color = "#ffffff";
    document.getElementById("font-s").style.color = "#ffffff";
    document.getElementById("font-m").style.color = "#ffffff";
    document.getElementById("font-" + misura).style.color = "#ff0000";
    createCookie("dimensionetesto", misura, 365);
}

function createCookie(name,value,days) {
	if (days) {
		var date = new Date();
		date.setTime(date.getTime()+(days*24*60*60*1000));
		var expires = "; expires="+date.toGMTString();
	}
	else expires = "";
	document.cookie = name+"="+value+expires+"; path=/";
}
function readCookie(name) {
	var nameEQ = name + "=";
	var ca = document.cookie.split(';');
	for(var i=0;i < ca.length;i++) {
		var c = ca[i];
		while (c.charAt(0)==' ') c = c.substring(1,c.length);
		if (c.indexOf(nameEQ) == 0) return c.substring(nameEQ.length,c.length);
	}
	return null;
}

// imposta il giusto css
function setCSS(css) {
	var head_ = document.getElementsByTagName("head")[0];
	var link_ = document.getElementsByTagName("link");
	for(i=0; i<link_.length; i++) {
		if(link_[i].href.indexOf("testo") >= 0) 
			head_.removeChild(link_[i]); 
    }
	link_ = document.createElement("link"); // creo un nuovo tag <link />
	link_.rel="stylesheet";
	link_.type="text/css";
	link_.href=css;
	link_.media="screen";
	head_.appendChild(link_); // aggiungo il nuovo tag <link />
}