/*************************************************************************
Text Sizer Form SachinBadhe for T-worx
*************************************************************************/
var tw_fontSizerDX = {
    sizeUnit: "px",
    defaultSize: 11,
    maxSize: 20,
    minSize: 11,
    sizerDivId: 'sizer', // div id for sizer controls
    queryName: "tw_fsz", // name to check query string for when passing size in URL
    cookieLifetime: 180, // how long to keep cookie
    
    adjustList: [],  // set method populates

    setDefaults: function(unit, dflt, mn, mx, sels) {
        this.sizeUnit = unit; this.defaultSize = dflt;
        this.maxSize = mx;    this.minSize = mn;
        if (sels) this.set(dflt, mn, mx, sels);
    },

    set: function (dflt, mn, mx, sels) { 
        var ln = this.adjustList.length;        
        for (var i=0; sels[i]; i++) {
            this.adjustList[ln+i] = [];
            this.adjustList[ln+i]["sel"]  = sels[i];
            this.adjustList[ln+i]["dflt"] = dflt;
            this.adjustList[ln+i]["min"]   = mn || this.minSize;
            this.adjustList[ln+i]["max"]   = mx || this.maxSize;
            // hold ratio of this selector's default size to this.defaultSize for calcs in adjust fn 
            this.adjustList[ln+i]["ratio"] = this.adjustList[ln+i]["dflt"] / this.defaultSize;
        }
    },

    addHandlers: function () {
        var sizerEl = document.getElementById( tw_fontSizerDX.sizerDivId );
        if ( !tw_fontSizerDX.sizeIncrement ) { tw_fontSizerDX.getSizeIncrement(); }
        var links = sizerEl.getElementsByTagName('img');
        for (var i=0; links[i]; i++) {
            if ( tw_hasClass( links[i], 'increase') ) {
                links[i].onclick = function () { tw_fontSizerDX.adjust( tw_fontSizerDX.sizeIncrement ); return false }
            } else if ( tw_hasClass( links[i], 'decrease') ) {
                links[i].onclick = function () { tw_fontSizerDX.adjust( -tw_fontSizerDX.sizeIncrement ); return false }
            } else if ( tw_hasClass( links[i], 'reset')  ) {
                links[i].onclick = function () { tw_fontSizerDX.reset(); return false }
            }
        }
        if (sizerEl) sizerEl.style.display = "block";
    },

    getSizeIncrement: function () {
        var val = 3;
        switch ( tw_fontSizerDX.sizeUnit ) {
            case 'px' : val = 3; break;
            case 'em' : val = .2; break;
            case '%' : val = 10; break;
        }
        tw_fontSizerDX.sizeIncrement = val;
    },
    
    init: function() {
        if ( !document.getElementById || !document.getElementsByTagName || !document.createElement ) return;
        var _this = tw_fontSizerDX;
        if ( !_this.doControlsSetup ) {
            _this.addHandlers();
        } else {
            _this.setupControls();
        }
        var size;
        // check query string and cookie for fontSize
        // check size (in case default unit changed or size passed in url out of range)
        size = tw_getValueFromQueryString( _this.queryName );
        if ( isNaN( parseFloat(size) ) || size > _this.maxSize || size < _this.minSize ) {
            size = tw_getCookie("fontSize");
            if ( isNaN( parseFloat(size) ) || size > _this.maxSize || size < _this.minSize ) {
                size = _this.defaultSize;
            }
        } 
        // if neither set nor setDefaults populates adjustList, apply sizes to body and td's
        if (_this.adjustList.length == 0) _this.set(  _this.defaultSize, _this.minSize, _this.maxSize, ['body', 'td'] ); 
        _this.curSize = _this.defaultSize;  // create curSize property to use in calculations 
        if ( size != _this.defaultSize ) _this.adjust( size - _this.defaultSize );
    },

    adjust: function(n) {
        if ( !this.curSize ) return; 
        var alist, size, list, i, j;
        // check against max/minSize
        if ( n > 0 ) {
            if ( this.curSize + n > this.maxSize ) n = this.maxSize - this.curSize;
        } else if ( n < 0 ) {
            if ( this.curSize + n < this.minSize ) n = this.minSize - this.curSize;
        }
        if ( n == 0 ) return;
        this.curSize += n;
        // loop through adjustList, calculating size, checking max/min
        alist = this.adjustList;
        for (i=0; alist[i]; i++) {
            size = this.curSize * alist[i]['ratio']; // maintain proportion 
            size = Math.max(alist[i]['min'], size); size = Math.min(alist[i]['max'], size);
            list = tw_getElementsBySelector( alist[i]['sel'] );
            for (j=0; list[j]; j++) { list[j].style.fontSize = size + this.sizeUnit; }
        }
        tw_setCookie( "fontSize", this.curSize, this.cookieLifetime, "/" );
    },

    reset: function() {
        if ( !this.curSize ) return; 
        var alist = this.adjustList, list, i, j;
        for (i=0; alist[i]; i++) {
            list = tw_getElementsBySelector( alist[i]['sel'] );
            for (j=0; list[j]; j++) { 
                // Reset adjustList elements to their default sizes
                //list[j].style.fontSize = alist[i]['dflt'] + this.sizeUnit;
                list[j].style.fontSize = '';  // restores original font size (unless set inline!)
            } 
        }
        this.curSize = this.defaultSize;
        tw_deleteCookie("fontSize", "/");
    }

};

// resource: simon.incutio.com/archive/2003/03/25/getElementsBySelector
function tw_getElementsBySelector(selector) {
    if (!document.getElementsByTagName) return [];
    var nodeList = [document], tokens, bits, list, col, els, i, j, k;
    selector = selector.normalize();
    tokens = selector.split(' ');
    for (i=0; tokens[i]; i++) {
        if ( tokens[i].indexOf('#') != -1 ) {  // id
            bits = tokens[i].split('#'); 
            var el = document.getElementById( bits[1] );
            if (!el) return []; 
            if ( bits[0] ) {  // check tag
                if ( el.tagName.toLowerCase() != bits[0].toLowerCase() ) return [];
            }
            for (j=0; nodeList[j]; j++) {  // check containment
                if ( nodeList[j] == document || tw_contained(el, nodeList[j]) ) 
                    nodeList = [el];
                else return [];
            }
        } else if ( tokens[i].indexOf('.') != -1 ) {  // class
            bits = tokens[i].split('.'); col = [];
            for (j=0; nodeList[j]; j++) {
                els = tw_getElementsByClassName( bits[1], bits[0], nodeList[j] );
                for (k=0; els[k]; k++) { col[col.length] = els[k]; }
            }
            nodeList = [];
            for (j=0; col[j]; j++) { nodeList.push(col[j]); }
        } else {  // element 
            els = []; 
            for (j = 0; nodeList[j]; j++) {
                list = nodeList[j].getElementsByTagName(tokens[i]);
                for (k = 0; list[k]; k++) { els.push(list[k]); }
            }
            nodeList = els;
        }
    }
    return nodeList;
};

function tw_getElementsByClassName(sClass, sTag, oCont) {
    var result = [], list, i;
    var re = new RegExp("\\b" + sClass + "\\b", "i");
    oCont = oCont? oCont: document;
    if ( document.getElementsByTagName ) {
        if ( !sTag || sTag == "*" ) { // for ie5
            list = oCont.all? oCont.all: oCont.getElementsByTagName("*");
        } else {
            list = oCont.getElementsByTagName(sTag);
        }
        for (i=0; list[i]; i++) 
            if ( re.test( list[i].className ) ) result.push( list[i] );
    }
    return result;
};

// obj: link or window.location
function tw_getValueFromQueryString(name, obj) {
    obj = obj? obj: window.location; 
    if (obj.search && obj.search.indexOf(name != -1) ) {
        var pairs = obj.search.slice(1).split("&"); // name/value pairs
        var set;
        for (var i=0; pairs[i]; i++) {
            set = pairs[i].split("="); // Check each pair for match on name 
            if ( set[0] == name && set[1] ) {
                return set[1];
            }
        }
    }
    return '';
}

function tw_hasClass(el, cl) {
    var re = new RegExp("\\b" + cl + "\\b", "i");
    if ( re.test( el.className ) ) {
        return true;
    }
    return false;
}

// returns true of oNode is contained by oCont (container)
function tw_contained(oNode, oCont) {
    if (!oNode) return; // in case alt-tab away while hovering (prevent error)
    while ( oNode = oNode.parentNode ) if ( oNode == oCont ) return true;
    return false;
};

if (!Array.prototype.push) {  // ie5.0
	Array.prototype.push =  function() {
		for (var i=0; arguments[i]; i++) this[this.length] = arguments[i];
		return this[this.length-1]; // return last value appended
	}
};

String.prototype.normalize = function() {
	var re = /\s\s+/g;
	return this.trim().replace(re, " ");
};

String.prototype.trim = function() {
	var re = /^\s+|\s+$/g;
	return this.replace(re, "");
};

// Created by: Simon Willison | http://simon.incutio.com/ 
// minor mod by shp dyn-web
function addLoadEvent(func) {
  var oldonload = window.onload;
  if (typeof window.onload != 'function') {
    //window.onload = func;
    window.onload = function() { func(); }
  } else {
    window.onload = function() {
      if (oldonload) {
        oldonload();
      }
      func();
    }
  }
}




// Modified from Bill Dortch's Cookie Functions (hidaho.com) 
// (found in JavaScript Bible)
function tw_setCookie(name,value,days,path,domain,secure) {
  var expires, date;
  if (typeof days == "number") {
    date = new Date();
    date.setTime( date.getTime() + (days*24*60*60*1000) );
		expires = date.toGMTString();
  }
  document.cookie = name + "=" + escape(value) +
    ((expires) ? "; expires=" + expires : "") +
    ((path) ? "; path=" + path : "") +
    ((domain) ? "; domain=" + domain : "") +
    ((secure) ? "; secure" : "");
}

// Modified from Jesse Chisholm or Scott Andrew Lepera ?
// (found at both www.dansteinman.com/dynapi/ and www.scottandrew.com/junkyard/js/)
function tw_getCookie(name) {
  var nameq = name + "=";
  var c_ar = document.cookie.split(';');
  for (var i=0; i<c_ar.length; i++) {
    var c = c_ar[i];
    while (c.charAt(0)==' ') c = c.substring(1,c.length);
    if (c.indexOf(nameq) == 0) return unescape( c.substring(nameq.length, c.length) );
  }
  return null;
}

// from Bill Dortch's Cookie Functions (hidaho.com) 
function tw_deleteCookie(name,path,domain) {
  if ( tw_getCookie(name) ) {
    document.cookie = name + "=" +
      ((path) ? "; path=" + path : "") +
      ((domain) ? "; domain=" + domain : "") +
      "; expires=Thu, 01-Jan-70 00:00:01 GMT";
  }
}
// setDefaults arguments: size unit, default size, minimum, maximum
// optional array of elements or selectors to apply these defaults to
tw_fontSizerDX.setDefaults( "px", 11, 8, 20, ['body', 'td', 'html', 'ol', 'ul', 'li', 'th', 'h1', 'h2', 'h3', 'h4', 'h5', 'h6', 'div', 'p', 'a', 'span', 'font'] );

addLoadEvent( tw_fontSizerDX.init );