javascript删除javascript生成的html代码

function addEduInfo()  //添加学历信息
{
    var seed=Number(document.getElementById("txtSeed").value);
    seed+=1;
    if(seed <6)
    {
    document.getElementById("txtSeed").value=seed;
    var addHtml=" <table width=\"100%\" border=\"0\" cellpadding=\"0\" cellspacing=\"0\" id=\"t_edu_"+seed+"\"> <tr>"
                +" <td width=\"100\" height=\"30\" align=\"right\"> <span style=\"color:#FF0000;\">* </span>学校名称： </td>"
                +" <td> <input name=\"txtSchoolName_"+seed+"\" type=\"text\" id=\"txtSchoolName_"+seed+"\" maxlength=\"100\" /> </td>"
                +" <td width=\"100\" align=\"right\"> <span style=\"color:#FF0000;\">* </span>学历： </td> <td> <select name=\"ddlEducation_"+seed+"\" id=\"ddlEducation_"+seed+"\"> </select> </td> </tr>"
                +"