/* Font Resize Script */
/* Cookie Handling Script */

var fontresize = {
    sizeUnit: "px",
    defaultSize: 11,
    maxSize: 13,
    minSize: 9,
    sizerDivId: 'sizer', 
    queryName: "ds_fsz",
    cookieLifetime: 180, 
    adjustList: [], 

    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;
            this.adjustList[ln+i]["ratio"] = this.adjustList[ln+i]["dflt"] / this.defaultSize;
        }
    },

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

    getSizeIncrement: function () {
        var val = 2;
        switch ( fontresize.sizeUnit ) {
            case 'px' : val = 1; break;
            case 'em' : val = .2; break;
            case '%' : val = 10; break;
        }
        fontresize.sizeIncrement = val;
    },
    
    init: function() {
        if ( !document.getElementById || !document.getElementsByTagName || !document.createElement ) return;
        var _this = fontresize;
        if ( !_this.doControlsSetup ) {
            _this.addHandlers();
        } else {
            _this.setupControls();
        }
        var size;
        size = ds_getValueFromQueryString( _this.queryName );
        if ( isNaN( parseFloat(size) ) || size > _this.maxSize || size < _this.minSize ) {
            size = GetCookie("fontSize");
            if ( isNaN( parseFloat(size) ) || size > _this.maxSize || size < _this.minSize ) {
                size = _this.defaultSize;
            }
        } 
        if (_this.adjustList.length == 0) _this.set(  _this.defaultSize, _this.minSize, _this.maxSize, ['body', 'td'] ); 
        _this.curSize = _this.defaultSize; 
        if ( size != _this.defaultSize ) _this.adjust( size - _this.defaultSize );
    },

    adjust: function(n) {
        if ( !this.curSize ) return; 
        var alist, size, list, i, j;
        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;
        alist = this.adjustList;
        for (i=0; alist[i]; i++) {
            size = this.curSize * alist[i]['ratio'];
            size = Math.max(alist[i]['min'], size); size = Math.min(alist[i]['max'], size);
            list = ds_getElementsBySelector( alist[i]['sel'] );
            for (j=0; list[j]; j++) { list[j].style.fontSize = size + this.sizeUnit; }
        }
        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 = ds_getElementsBySelector( alist[i]['sel'] );
            for (j=0; list[j]; j++) { 
                list[j].style.fontSize = ''; 
            } 
        }
        this.curSize = this.defaultSize;
        DeleteCookie("fontSize", "/");
    }

};

function ds_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 ) {
            bits = tokens[i].split('#'); 
            var el = document.getElementById( bits[1] );
            if (!el) return []; 
            if ( bits[0] ) {
                if ( el.tagName.toLowerCase() != bits[0].toLowerCase() ) return [];
            }
            for (j=0; nodeList[j]; j++) {
                if ( nodeList[j] == document || ds_contained(el, nodeList[j]) ) 
                    nodeList = [el];
                else return [];
            }
        } else if ( tokens[i].indexOf('.') != -1 ) {
            bits = tokens[i].split('.'); col = [];
            for (j=0; nodeList[j]; j++) {
                els = ds_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 { 
            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 ds_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 == "*" ) { 
            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;
};

function ds_getValueFromQueryString(name, obj) {
    obj = obj? obj: window.location; 
    if (obj.search && obj.search.indexOf(name != -1) ) {
        var pairs = obj.search.slice(1).split("&"); 
        var set;
        for (var i=0; pairs[i]; i++) {
            set = pairs[i].split("=");
            if ( set[0] == name && set[1] ) {
                return set[1];
            }
        }
    }
    return '';
}

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

function ds_contained(oNode, oCont) {
    if (!oNode) return;
    while ( oNode = oNode.parentNode ) if ( oNode == oCont ) return true;
    return false;
};

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

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, "");
};