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 changeTextSize() {
    var currentsize = eval(readCookie('textsize'));
    switch (currentsize)
    {
        case 0:
          document.writeln('<style type="text/css"> body { font-size:55%; } </style>');
          break;
        case 1:
          document.writeln('<style type="text/css"> body { font-size:65%; } </style>');
          break;
        case 2:
          document.writeln('<style type="text/css"> body { font-size:75%; } </style>');
          break;
        case 3:
          document.writeln('<style type="text/css"> body { font-size:90%; } </style>');
          break;
        case 4:
          document.writeln('<style type="text/css"> body { font-size:105%; } </style>');
          break;
        case 5:
          document.writeln('<style type="text/css"> body { font-size:120%; } </style>');
          break;    
        default:
          document.writeln('<style type="text/css"> body { font-size:75%; } </style>');
    }
}

function decTextSize() {
    //test if cookie exists
    var exist = readCookie('textsize');
    if (!(exist)) {
	    var newsize = 3;
    }
    else {
	    var oldsize = eval(exist);
        if (oldsize > 0) {
	        var newsize = oldsize - 1;
        }
        else if (oldsize == 0) {
	        var newsize = 0;
        }
    }
    createCookie('textsize',newsize,500);
}

function incTextSize() {
    //test if cookie exists
    var exist = readCookie('textsize');
    if (!(exist)) {
	    var newsize = 3;
    }
    else {
	    var oldsize = eval(exist);
        if (oldsize < 5) {
	        var newsize = oldsize + 1;
        }
        else if (oldsize == 5) {
	        var newsize = 5;
        }
    }
    createCookie('textsize',newsize,500);
}

//check style colours for change. 
var x = readCookie('style');
if (x) {
    var StyleFile = "style" + x + ".css";
    document.writeln('<link rel="stylesheet" type="text/css" href="/_shared/site/css/' + StyleFile + '">');
}
//if black, load white icons
if (x=='1') {
    document.writeln('<link rel="stylesheet" type="text/css" href="/_shared/site/css/icons_w.css">');
}

//check text size for change.
var y = changeTextSize();