function new_req()
{
	var a=null;
	if(window.activexobject)
	{
		a=new activexobject("msxml2.xmlhttp");
		if(!a)
		{
			a=new activexobject("microsoft.xmlhttp");
		}
	}
	else if(window.xmlhttprequest)
	{
		a=new xmlhttprequest();
	}
	return a;
}
function isundefined(variable) {
	return typeof variable == 'undefined' ? true : false;
}

function _post(url, args, fn, sync)
{
   sync=isundefined(sync)?true:sync;
   var req = new_req();
	try{
	   req.open('post', url,sync);
	}
	catch(ex){
	   alert(ex.description);
	   return;
	}
	req.setrequestheader("method", "post " + url + " http/1.1");
	req.setrequestheader("content-type", "application/x-www-form-urlencoded");
	req.onreadystatechange = function() {
		if (req.readystate == 4){
			var s;
			try {s = req.status;}catch (ex) {
					alert(ex.description);
			}
			if (s == 200)fn(req);
		}
	}
	req.send(args);
}
var el=function(id)
{
   return document.getelementbyid(id);
}
//����ϊ��
function isnotnull(txt,name)
{
    var str=el(txt).value;
    while(str.indexof(" ")!=-1){
        str=str.replace(" ","");
    }

    if(str=="")
    {
        alert(name);
        return false;
    }
    else
    {
        return true;
    }
}

function selectall(name) {
    var str='';       
    var ids = document.getelementsbyname(name);       
    for (var i = 0; i < ids.length; i++)        
    {              
        if(ids[i].checked)
            str+=ids[i].value+';';       
    }
    return str;
}

function clearnonum(obj) {
    //�ȱѷ����ֵķ��滻����������ֺ�.
    obj.value = obj.value.replace(/[^\d.]/g, "");
    //���뱣֤��һ��ϊ���ֶ�����.
    obj.value = obj.value.replace(/^\./g, "");
    //��ֻ֤�г���һ��.��û�ж��.
    obj.value = obj.value.replace(/\.{2,}/g, ".");
    //��֤.ֻ����һ�σ������ܳ�����������
    obj.value = obj.value.replace(".", "$#$").replace(/\./g, "").replace("$#$", ".");
    //obj.value = obj.value.replace(/\.\d\d\d$/g,".");
}

function txtnonum(obj) {
    if (/\.\d\d$/.test(obj.value))
        event.returnvalue = false;
}