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('price-table');
    	ZebraTable.stripe('price-add-table');
    }