Tip Box，自定义html标签属性

<input type="text" name="usr005" desc="必须输入中文！不多于10个中文字符！" />

// 修改文本框的属性
	(function() {
		var _inputList = document.getElementsByTagName("INPUT");
		var _selectList = document.getElementsByTagName("SELECT");
		var _areaList = document.getElementsByTagName("TEXTAREA");

		for (var i = 0; i < _inputList.length; i++) {
			var obj = _inputList[i];
			// onfocus在firefox的text失效bug
			obj.onmouseover = function(e) {
				var _obj = this;
				var desc = _obj["desc"] || _obj.getAttribute("desc");
				e = e || window.event;

				if(desc == undefined) {
					return;
				}

				var _div_id = "altas_" + _obj["name"];

				var desc_div = document.getElementById(_div_id);

				if(!desc_div) {
					desc_div = document.createElement("DIV");
					desc_div.id = _div_id;
				}

				desc_div.style.top = e.clientY + "px";
				desc_div.style.left = e.clientX + "px";				
				desc_div.setAttribute("class", "promote");  
				desc_div.innerHTML = desc;	

				desc_div.style.display = "block";	
				document.body.appendChild(desc_div);
			};

			obj.onmouseout = function() {
				var _obj = this;
				var _id = "altas_" + _obj["name"];
				var _tip = document.getElementById(_id);
				// 如果该text有tipbox，则隐藏该tipbox
				_tip && (_tip.style.display = "none");
			};
		}
	})();

这样做产生了很多问题，页面会有n多div，有没有名字污染的可能？

多个同名的text会有相同id的div提示框

事件绑定需要改进，需要支持一个事件上绑定多个函数

[img]http://lucane.iteye.com/upload/picture/pic/37711/45f88eb5-32b7-3bcf-997f-b2d901234f77.png[/img]

[img]http://lucane.iteye.com/upload/picture/pic/37709/1f03c840-6a61-3a1a-901e-40c8e01c3cbe.png[/img]