function mycheck() 
{
	if (form1.tbUserName.value=="")
	{
    	alert("用户名不能为空");
    	return false;
  	}
	if (form1.tbPassword.value=="")
	{
    	alert("密码不能为空");
    	return false;
  	}
	if (form1.tbcheckcode.value=="")
	{
    	alert("验证码不能为空");
    	return false;
  	}
}

function resetBtn(fm){
    fm.reset();
    return false;
}

function SetCwinHeight_mytop() {
var a=document.getElementById("mytop");
if (document.getElementById) {
if (a && !window.opera) {
if (a.contentDocument && a.contentDocument.body.offsetHeight)
a.height = a.contentDocument.body.offsetHeight; 
else if (a.Document && a.Document.body.scrollHeight)
a.height = a.Document.body.scrollHeight;
}}}

function SetCwinHeight_mybook() {
var a=document.getElementById("mybook");
if (document.getElementById) {
if (a && !window.opera) {
if (a.contentDocument && a.contentDocument.body.offsetHeight)
a.height = a.contentDocument.body.offsetHeight; 
else if (a.Document && a.Document.body.scrollHeight)
a.height = a.Document.body.scrollHeight;
}}}