// 回车提交表单
document.onkeydown = function(evt){
	var evt = window.event?window.event:evt;
	if(evt.keyCode==13) {
		return checkForm();
		document.forms["login"].submit();		
	}
}

//验证表单
function checkForm(theform){
	checkUserName();
	checkPassword();

    if( msgUserName != "" || msgPassword != "" ){
        return false;
	}
	return true;
}

//验证用户
function checkUserName() {
   username=document.getElementById("oUserName").value;
   
   if (username == "" || username == "请输入您的登录名") {
   	    msg = "<font color='red'>请填写登录名！</font>";
		msgUserName = "请输入登录名！";
		var ch=document.getElementById("errInfo");
		ch.innerHTML= msg ;	
   } else {
		msg = "已填写登录名";
		msgUserName = "";
   }
}

//验证密码
function checkPassword() {
   password = document.getElementById("oPassword").value;
   
   if (password == "") {
   	    msg = "<font color='red'>请输入登录密码！</font>";
		msgPassword = "请输入登录密码！";
		var ch=document.getElementById("errInfo");
		ch.innerHTML= msg ;	
   } else {
		msg = "已填写密码";
		msgPassword = "";
   }
}