/**
 *一些常用方法
 */
 
 	//去掉字符串的空格
  	String.prototype.Trim = function(){
  	
  		return this.replace(/(^\s*)|(\s*$)/g, ""); 
    }  
    //判断n是否是数字
    function isNumber(n){
		var flag;
		for(var i=0;i<n.length;i++){
			var m=n.substring(i,i+1);
			if(m>=1 || m<=9){
				flag=true;
			}
			else{
				flag=false;
				break;
			}
		}
		return flag;
	}
    function getSelectedValue(selectId){
    	var select = document.getElementById(selectId).options;
    	for(var i = 0; i < select.length;i++){
    		if(select[i].selected){
    			return select[i].value;
    		}
    	}
    	return "";
    }
    function getSelectedText(selectId){
    	var select = document.getElementById(selectId).options;
    	for(var i = 0; i < select.length;i++){
    		if(select[i].selected){
    			return select[i].innerText;
    		}
    	}
    	return "";
    }
    function setSelected(selectId,selectValue){
    	var select = document.getElementById(selectId).options;
    	for(var i = 0;i < select.length;i++){
    		if(select[i].value == selectValue){
    			select[i].selected = true;
    			break;
    		}
    	}
    }
	
	/*
	 * url：访问的地址 
	 * processFunction：返回的处理函数，只需要输入函数名不带括号
	 */
	function send_request(url,processFunction){
  		http_request=false;
  		//创建XMLHttpRequest
  		if(window.XMLHttpRequest){// IE
  			http_request=new XMLHttpRequest();
  			if(http_request.overrideMimeType){
  				http_request.overrideMimeType("text/xml");
  			}
  		}
  		else if(window.ActiveXObject){
  			try{
  				http_request=new ActiveXObject("Msxml12.XMLHTTP");
  			}
  			catch(e){
  				try{
  					http_request=new ActiveXObject("Microsoft.XMLHTTP");
  				}
  				catch(e){}
  			}
  		}
  		if(!http_request){
  			window.alert("创建XMLHTTPREQUEST失败！");
  			return false;
  		}
  		http_request.onreadystatechange=eval(processFunction);
  		http_request.open('POST',url,true);
  		http_request.send(null);
  	}
  	window.onerror = function(){return false;};