function chkVote61()
{
	var fm=document.voteForm61;
	var chkForm=false;
	for(i=0;i<fm.voteOption.length;i++)
	{
		if(fm.voteOption[i].checked==false)
		{
			chkForm=false;
		}else{
			chkForm=true;
			break;
		}
	}
	if(chkForm==false)
	{
		alert("请选择至少一个选项");
		return false;
	}
	window.open('','newVoteWin','width=750,height=300');
	fm.submit();
}
<div class="cwwVoteT">您认为净化网络当务之急是？</div><div class="cwwVoteI"></div>document.write('<table width="100%" align="center" cellpadding=0 cellspacing=0 border=0>');
document.write('<form name="voteForm61" action="" method="post" target="newVoteWin">');
document.write('<tr>');
document.write('<td class="cwwVoteO"><input type="checkbox" name="voteOption" value="0">');
document.write('<input type="hidden" value="1012" name="voteID">');
document.write('国家立法</td>');
document.write('</tr>');
document.write('<tr>');
document.write('<td class="cwwVoteO"><input type="checkbox" name="voteOption" value="1">');
document.write('<input type="hidden" value="1013" name="voteID">');
document.write('运营商监督</td>');
document.write('</tr>');
document.write('<tr>');
document.write('<td class="cwwVoteO"><input type="checkbox" name="voteOption" value="2">');
document.write('<input type="hidden" value="1014" name="voteID">');
document.write('靠个人自律</td>');
document.write('</tr>');
document.write('<tr><td><input type="hidden" value="61" name="articleID"><input type="button" value="提交" onclick="javascript:this.form.action=\'?action=vote\';chkVote61()"><input type="button" value="查看" onclick="javascript:window.open(\'\',\'newVoteWin\',\'width=750,height=300\');this.form.action=\'?action=check\';this.form.submit()"></td></tr>');
document.write('</form>');
document.write('</table>');