var min=8;
var max=18;

function onload() {
    initialFontSizeDelta(document.getElementById('contentDiv'));
}

function initialFontSizeDelta(baseControl) {
    var sizedelta = readCookie("sizedelta");
    if (sizedelta == null)
        sizedelta = "0";
    var font = baseControl.getElementsByTagName('font');
    for (i = 0; i < font.length; i++) {
        if (font[i].style.fontSize) {
            var s = parseInt(font[i].style.fontSize.replace("px", ""));
        }
        else {
            var s = 12;
        }
        if (s != max) {
            s += parseInt(sizedelta);
        }
        font[i].style.fontSize = s + "px";
    }
}

function increaseFontSize(baseControl) 
{
   var sizedelta = readCookie("sizedelta"); 
   if (sizedelta == null)
       sizedelta = "0";
   var font = baseControl.getElementsByTagName('font');
   var changed = false;
   for(i=0;i<font.length;i++) 
   {
      if(font[i].style.fontSize) 
      {
         var s = parseInt(font[i].style.fontSize.replace("px",""));
      } 
      else
      {
         var s = 12;
      }
      if(s!=max) {
         s += 1;
         changed = true;
      }
      font[i].style.fontSize = s+"px";
  }
  if (changed)
   createCookie("sizedelta", parseInt(sizedelta) + 1);

}

function decreaseFontSize(baseControl) 
{
   var sizedelta = readCookie("sizedelta");
   if (sizedelta == null)
       sizedelta = "0";
   var font = baseControl.getElementsByTagName('font');
   var changed = false;
   for (i = 0; i < font.length; i++) 
   {
      if(font[i].style.fontSize) 
      {
         var s = parseInt(font[i].style.fontSize.replace("px",""));
      } 
      else 
      {
         var s = 12;
      }
      if(s!=min) 
      {
         s -= 1;
         changed = true;
     }
      font[i].style.fontSize = s+"px";
   }
   if (changed)
      createCookie("sizedelta", parseInt(sizedelta) - 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);
}