function setFontSize(size)
    { 
        var body = document.getElementsByTagName('body');
        for(i=0;i<body.length;i++) 
        {
            body[i].style.fontSize = size+"pt"
            createCookie("font-size", size);
        }
    }
    function alterFontSize(offset)
    {
        var min=9;
        var max=18;
        var body = document.getElementsByTagName('body');
        for(i=0;i<body.length;i++) {
          if(body[i].style.fontSize) {
             var size = parseInt(body[i].style.fontSize.replace("pt",""));
          } else {
             var size = 10;
          }
          if(size!=max) {
             size += offset;
          }
         setFontSize(size);
       }
    }
    function increaseFontSize() {
       alterFontSize(+1);
    }
    function decreaseFontSize() {
       alterFontSize(-1);
    }
    
    
    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);
    }