var fr_original_size = 100;
var fr_minimum_size = fr_original_size * 0.8;
var fr_maximum_size = fr_original_size * 1.6;
var fr_cookieName = 'fr_current_size';
var fr_cookieAge = 30; // days


function fr_resize( element, delta ) {
	var current_size;
	
	if ( current_size = readCookie(fr_cookieName) ) { // normal operation, when cookie has been set
		current_size = parseInt(current_size);
	} else if( element.style.fontSize ) { // after reset - no cookie, but fontsize is set
		current_size = parseInt(element.style.fontSize.replace("%",""));
	} else { // initial click of resize button - no cookie or fontsize
		current_size = fr_original_size;
	}

	var new_size = current_size + delta;

	if( new_size > fr_maximum_size ) {
		new_size = fr_maximum_size;
	} 
	
	if (new_size < fr_minimum_size) {
		new_size = fr_minimum_size;
	} 
	
	fr_setsize(element, new_size);
	
	if( new_size != current_size ) {
		fr_setcookie( new_size );
	}
}

function fr_reset( element )
{
// 	alert('reset to ' + fr_original_size);
	fr_setsize(element, fr_original_size);
	eraseCookie(fr_cookieName);
}

function fr_setsize(element, size) {
// 	alert('set size of ' + element + ' to ' + size); 
	element.style.fontSize = size + "%";
}

function fr_setcookie( size )
{
// 	alert('set cookie to ' + size);
	createCookie(fr_cookieName, size, fr_cookieAge);
}


/************************** HANDY COOKIE FUNCTIONS *****************************/
/*************** FROM http://www.quirksmode.org/js/cookies.html ****************/

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 var 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;
}

function eraseCookie(name) {
	createCookie(name,"",-1);
}