var Event = {
        add: function(obj,type,fn) {
                if (obj.attachEvent) {
                        obj['e'+type+fn] = fn;
                        obj[type+fn] = function() { obj['e'+type+fn](window.event); }
                        obj.attachEvent('on'+type,obj[type+fn]);
                } else
                obj.addEventListener(type,fn,false);
        },
        remove: function(obj,type,fn) {
                if (obj.detachEvent) {
                        obj.detachEvent('on'+type,obj[type+fn]);
                        obj[type+fn] = null;
                } else
                obj.removeEventListener(type,fn,false);
        }
}

function $() {
        var elements = new Array();
        for (var i=0;i<arguments.length;i++) {
                var element = arguments[i];
                if (typeof element == 'string') element = document.getElementById(element);
                if (arguments.length == 1) return element;
                elements.push(element);
        }
        return elements;
}

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

function addClassName(el,className) {
        removeClassName(el,className);
        el.className = (el.className + " " + className).trim();
}

function removeClassName(el,className) {
        el.className = el.className.replace(className,"").trim();
}

var ZebraTable = {
        bgcolor: '',
        classname: '',
        stripe: function(el) {
                if (!$(el)) return;
                var rows = $(el).getElementsByTagName('tr');
                for (var i=1,len=rows.length;i<len;i++) {
                        if (i % 2 == 0) rows[i].className = 'alt';
                        Event.add(rows[i],'mouseover',function() { ZebraTable.mouseover(this); });
                        Event.add(rows[i],'mouseout',function() { ZebraTable.mouseout(this); });
                }
        },
        mouseover: function(row) {
                this.bgcolor = row.style.backgroundColor;
                this.classname = row.className;
                addClassName(row,'over');
        },
        mouseout: function(row) {
                removeClassName(row,'over');
                addClassName(row,this.classname);
                row.style.backgroundColor = this.bgcolor;
        }
}

window.onload = function() {
        ZebraTable.stripe('stripedTable1');
        ZebraTable.stripe('stripedTable2');
        ZebraTable.stripe('stripedTable3');
        ZebraTable.stripe('stripedTable4');
        ZebraTable.stripe('stripedTable5');
        ZebraTable.stripe('stripedTable6');
        ZebraTable.stripe('stripedTable7');
        ZebraTable.stripe('stripedTable8');
}