function countCommentsContWord(){
	var leaveWord = 300 - postForm.content.value.length;
	if (leaveWord >= 0)
	{
		wordNum.innerHTML = "您还能输入" + leaveWord +"个字";
	}else{
		wordNum.innerHTML = "<font color=red>文字输入过多!<\/font>";
	}
}

function validateForm() {
	if((postForm.verifyCode.value.length!=4) || isNaN(postForm.verifyCode.value)){
		alert("请输入正确的验证码！");
		postForm.verifyCode.focus();
		if(document.getElementById('viewkey').innerHTML=='')
			{
			document.getElementById('viewkey').innerHTML='<img src=http://www.ruan8.com/cnum.php id=safecode border=0 onclick=reloadcode() alt=点击获取最新验证码 />';
			}
		return false; 
	}
	if(postForm.nickName.value.length ==  0) {
		alert("请输入您的昵称！");
		postForm.nickName.focus();
		return false; 
	}
	if(postForm.nickName.value.length > 20) {
		alert("昵称太长，字数不能超过20！");
		postForm.nickName.focus();
		return false; 
	}
	if(postForm.content.value.length ==  0) {
		alert("请输入评论内容");
		postForm.content.focus();
		return false; 
	}
	if(postForm.content.value.length > 300) {
		alert("内容太长，字数不能超过300");
		postForm.content.focus();
		return false; 
	}
	return true;
}

function reloadcode(){
var verify=document.getElementById('safecode');
verify.setAttribute('src','http://www.ruan8.com/cnum.php?'+Math.random());
}