function CheckForm(form){
var strContent=form.content.value;
form.content.value=frames.HtmlEditor.document.body.innerHTML;
if (form.MsgTitle.value==""){
alert('请输入您的留言主题')
form.MsgTitle.focus();
return false;
}
if (form.nickname.value==""){
alert('请输入您的名字')
form.nickname.focus();
return false;
}
if (form.VerifyCode.value==""){
alert('请输入您的验证码')
form.VerifyCode.focus();
return false;
}
if (form.mail.value!=""){
mail=form.mail.value;
if (!isEmail(mail)){
		alert("您输入的邮件不正确");
		form.mail.focus();
		return false;		
	}
	}
if (form.tel.value==""){
alert('请输入您的电话')
form.tel.focus();
return false;
}	
if (form.content.value=="") {
alert("请输入您的留言信息");
return false;
}

}

function isEmail(theStr)
{
	var unchar="/\\;:,";
	var atIndex = theStr.indexOf('@');
	var dotIndex = theStr.indexOf('.', atIndex);
	var flag = true;
	for (i=0;i<theStr.length;i++){	
		if (unchar.indexOf(theStr.substr(i,1)) > -1){
			return false;		
		}
	}
	theSub = theStr.substring(0, dotIndex+1)
	if ((atIndex < 1)||(atIndex != theStr.lastIndexOf('@'))||(dotIndex < atIndex + 2)||(theStr.length <= theSub.length)) 
	{	flag = false; }
	else { flag = true; }
	return(flag);

}