// This Javascript is written by Peter Velichkov (http://blog.creonfx.com)
// and is distributed under the following license : http://creativecommons.org/licenses/by-sa/3.0/
// Use and modify all you want just keep this comment. Thanks

var incdec = 0;
var headID = document.getElementsByTagName("head")[0];
var cssNode = document.createElement("style");
cssNode.type = 'text/css';
cssNode.id="resizingText";

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);
}

function loadCss(x){
        try{
                var cssStr = '\
                #container {font-size:' + (100+x) +'%;}\
                ';
                if(cssNode.styleSheet){
                        cssNode.styleSheet.cssText = cssStr; // for IE
                } else {
                        var cssText = document.createTextNode(cssStr);
                        cssNode.appendChild(cssText); // breaks ie
                        //cssNode.innerHTML = cssStr; // breaks saffari
                }
                if(!document.getElementById("resizingText"))headID.appendChild(cssNode);
        }catch(err){
                // some debugging code
        }
}

function increaseFontSize() {
        if(incdec < 15){
                incdec += 5;
                loadCss(incdec);
                createCookie('textsize',incdec,1);
        }
}

function decreaseFontSize() {
        if(incdec > 0){
                incdec -= 5;
                loadCss(incdec);
                createCookie('textsize',incdec,1);
        }
}
var x = readCookie('textsize')
if (x && x!=0) {
        x = parseInt(x);
        incdec = x;
        loadCss(x);
}

//eraseCookie('textsize');

Event.observe(window, 'load', function() {
    $('increase').observe('click', increaseFontSize);
    $('decrease').observe('click', decreaseFontSize);
})