/*
This code was published associated with a project listed in an open source forum.
And is used on the assumption that this is not an intellectual property of another firm or person.
How ever on araising any claims or notices demanding the withdrawal of the code will be treated
with deserved seriousness and will be eleminated atonce. 
*/



var dw_fontSizerDX = {
    sizeUnit: "px",
    defaultSize: 12,
    maxSize: 26,
    minSize: 9,
    sizerDivId: 'sizer', // div id for sizer controls
    queryName: "dw_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( dw_fontSizerDX.sizerDivId );
        if ( !dw_fontSizerDX.sizeIncrement ) { dw_fontSizerDX.getSizeIncrement(); }
        var links = sizerEl.getElementsByTagName('a');
        for (var i=0; links[i]; i++) {
            if ( dw_hasClass( links[i], 'increase') ) {
                links[i].onclick = function () { dw_fontSizerDX.adjust( dw_fontSizerDX.sizeIncrement ); return false }
            } else if ( dw_hasClass( links[i], 'decrease') ) {
                links[i].onclick = function () { dw_fontSizerDX.adjust( -dw_fontSizerDX.sizeIncrement ); return false }
            } else if ( dw_hasClass( links[i], 'reset')  ) {
                links[i].onclick = function () { dw_fontSizerDX.reset(); return false }
            }
        }
        if (sizerEl) sizerEl.style.display = "block";
    },

    getSizeIncrement: function () {
        var val = 2;
        switch ( dw_fontSizerDX.sizeUnit ) {
            case 'px' : val = 2; break;
            case 'em' : val = .2; break;
            case '%' : val = 10; break;
        }
        dw_fontSizerDX.sizeIncrement = val;
    },
    
    init: function() {
        if ( !document.getElementById || !document.getElementsByTagName || !document.createElement ) return;
        var _this = dw_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 = dw_getValueFromQueryString( _this.queryName );
        if ( isNaN( parseFloat(size) ) || size > _this.maxSize || size < _this.minSize ) {
            size = dw_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 = dw_getElementsBySelector( alist[i]['sel'] );
            for (j=0; list[j]; j++) { list[j].style.fontSize = size + this.sizeUnit; }
        }
        dw_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 = dw_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;
        dw_deleteCookie("fontSize", "/");
    }

};

function dw_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 || dw_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 = dw_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 dw_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 dw_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 dw_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 dw_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, "");
};