function checkLogin(){
	var loginName = document.getElementById("loginName");
	var pwd = document.getElementById("pwd");
	var md5Pwd = document.getElementById("md5Pwd");
	var valiCode = document.getElementById("valiCode");
	loginName.value=RemoveHeadBlank(loginName.value);
	valiCode.value=RemoveHeadBlank(valiCode.value);
	if(loginName.value==""){
		alert('请填写您在上海住房公积金网的用户名');loginName.focus();return false;
	}
	if(pwd.value==""){
		alert('请填写用户密码');pwd.focus();return false;
	}
	if(valiCode.value.length != 4){
			alert('请填写输入框右侧的四位数字验证码');valiCode.focus();return false;
	}
	md5Pwd.value = hex_md5(pwd.value);	
}