/*清除报错
function killErrors() 
{ 
return true; 
}   
window.onerror = killErrors;
*/

//下拉菜单
	function show(obj){
		var on=$(obj);
		on.style.display="block";
	}
	function hide(obj){
		var off=$(obj);
		off.style.display="none";
	}



//String方法扩充：trim() 删除字符串两端空格
//示例：this.trim()
String.prototype.trim = function(){
	return this.replace(/(^\s*)|(\s*$)/g, "");
}

//常用函数重命名
function $(obj){return document.getElementById(obj);}
function $$(obj){return document.getElementsByName(obj);}
function $$$(obj){return document.getElementsByTagName(obj);}
function $$$$(obj,tag){return document.getElementsByClassName(obj,tag);}