function check_nan(aft) {
	var check= /^\d+$/;
	var result= check.test(aft); 
	return result;
}
function reload_code_img() {
	var aft		=document.getElementById('board_form');
	var codeimg	=document.getElementById('codeimg');
	var z			=new Date();
	codeimg.src	=TheURL+'code.php?'+z.getTime();
	aft.code.value='';
	aft.code.focus();
}
function board_preview() {
	var aft		=document.getElementById('board_preview_form');
	var board		=document.getElementById('board_form');
	var mind		=document.getElementById('mmin');
	var min		=eval(mind.innerHTML);
	if (board.nickname.value =='') {
		alert('请输入匿称 !!!');
		board.nickname.focus();
		return false;
	}
	if (board.code.value =='') {
		alert('请输入验证码 !!!');
		board.code.focus();
		return false;
	}
	if (check_nan(board.code.value) !=true || board.code.value.length !=5) {
		alert('验证码输入错误\n\n若看不清楚数字，请点按图片更换 !!!');
		board.code.focus();
		return false;
	}
	if (board.mess.value.length <min) {
		alert('内容请至少输入 '+min+' 个字元 !!');
		board['mess'].focus();
		return false;
	}
	window.open('about:blank','board_preview_frame','width=692,height=200,scrollbars=yes');
	aft.nickname.value=board.nickname.value;
	aft.mess.value=board.mess.value;
	aft.submit();
}
function board_post(aft) {
	var mind		=document.getElementById('mmin');
	var vote		=document.getElementById('vote_form');
	var min		=eval(mind.innerHTML);
	
	if (aft.nickname.value =='') {
		alert('请输入匿称 !!!');
		aft.nickname.focus();
		return false;
	}
	if (aft.code.value =='') {
		alert('请输入验证码 !!!');
		aft.code.focus();
		return false;
	}
	if (check_nan(aft.code.value) !=true || aft.code.value.length !=5) {
		alert('验证码输入错误\n\n若看不清楚数字，请点按图片更换 !!!');
		aft.code.focus();
		return false;
	}
	if (aft.mess.value.length <min) {
		alert('内容请至少输入 '+min+' 个字元 !!');
		aft.mess.focus();
		return false;
	}
	if (vote && !confirm('您还没投票呢!\n\n确定不投票而直接发表心得吗?\n')) {
		return false;
	}
	aft.submit.disabled=true;
}
function isreset() {
	var aft		=document.getElementById('board_form');
	if (confirm('确定清除文章内容重写吗?')) {
		aft.nickname.focus();
		aft.reset();
	}
	return false;
}