/*  
    dw_fontsizer.js  version date: Jan 2004
    requires dw_cookies.js
    
    This code manipulates document.body.style.fontSize.
    Other elements sized using relative measures (em's or %)
    in style sheets will adjust accordingly. 
    Exclude elements (i.e., selectors) by using pixels, points or 
    constants (small, medium, etc.) to set their font-size in style sheets.
*/

/*************************************************************************
  This code is from Dynamic Web Coding at http://www.dyn-web.com/
  Copyright 2004 by Sharon Paine 
  See Terms of Use at http://www.dyn-web.com/bus/terms.html
  regarding conditions under which you may use this code.
  This notice must be retained in the code as is!
*************************************************************************/

var dw_fontSizer = {
  // sizeUnit and defaultSize for body.style.fontSize
  sizeUnit: "px",
  defaultSize: 13,
  // numbers (same unit as sizeUnit)
  maxSize:     24,
  minSize:     10,

  init: function() {
    if ( !document.body || !document.getElementById ) return;
    var size = window.location.search? window.location.search.slice(1): getCookie("fontSize");
    size = !isNaN( parseFloat(size) )? parseFloat(size): this.defaultSize;
    // in case default unit changed or size passed in url out of range
    if ( size > this.maxSize || size < this.minSize ) size = this.defaultSize;
    var sizerEl = document.getElementById('sizer');
    if (sizerEl) sizerEl.style.display = "block";
    document.body.style.fontSize = size + this.sizeUnit;
  },
  
  adjust: function(inc) {
    var size = parseFloat( document.body.style.fontSize );
    size += inc;
    // Test against max and min sizes 
    if (inc > 0) size = Math.min(size, this.maxSize);
    else size = Math.max(size, this.minSize);
    setCookie( "fontSize", size, 180, "/" );
    document.body.style.fontSize = size + this.sizeUnit;
  },

  reset: function() {
    document.body.style.fontSize = this.defaultSize + this.sizeUnit;
    deleteCookie("fontSize", "/");
  }
  
}