/***
**@function:js字符串处理操作
**@author:李敬塔
**@email
**@copyright:
**@createDate:2009-01-05
**/
//去除左边空格
String.prototype.trim = function()
{
    return this.replace(/(^[\s]*)|([\s]*$)/g, "");
}
//去除右边空格
String.prototype.lTrim = function()
{
    return this.replace(/(^[\s]*)/g, "");
}
//去除两边空格
String.prototype.rTrim = function()
{
    return this.replace(/([\s]*$)/g, "");
}

//将HTML标签转换为文本
function toHTML(str){
	if(str==null || str=="" 
	|| typeof(str)=="undefined"){
		return str;
	}
	str = str.replace(/&/g,"&");
	str = str.replace(/</g,"&lt;");
	str = str.replace(/>/g,"&gt;");
	str = str.replace(/ /g,"&nbsp;");
	str = str.replace(/(\r\n)|(\n)/gi,"<br>");
	return str;
}
//转换常用的符号
function toEntity(str){
	if(str==null || str=="" 
	|| typeof(str)=="undefined"){
		return str;
	}
	str = str.replace(/&/g,"&amp;");
	//str = str.replace(/ /g,"&nbsp;");
	str = str.replace(/(\r\n)|(\n)/gi,"<br>");
	return str;
}
//解析ＵＲＬ字符
function getURLParam(strParamName,URLstr){
	var strReturn='';
	if(typeof(URLstr)!="undefined" && URLstr!=null){
		var query=URLstr;
	}else{//获取URL中？后面的部分,URLstr字符串为空，则取本地URL
		var query=this.location.search.substring(1); 
	}
	if (query.length > 0){
	  var params=query.split("&");
	  for (var i=0 ; i<params.length ; i++){
		   var pos = params[i].indexOf("=");
		   var name = params[i].substring(0, pos);
		   var value = params[i].substring(pos + 1);
		   if (name==strParamName) {
		    	strReturn=value;break;
		   } 
		 }
	}
	return strReturn;
}