javascript operate Html select elements

// JScript 文件
 function __deleteAll(__state,_v)
{ 
 var arrInp= document.getElementsByName(_v);
    for (i=0;i<arrInp.length;i++) {               
        arrInp[i].checked=__state;
    }
}
//加密要调用的js method
function __deleteAllSendOrder(_v,path,form1)
{
    var idTmp = '';
    var arrInp= document.getElementsByName(_v);
    var n=0;
    for (i=0;i<arrInp.length;i++) {
        if(arrInp[i].type=="checkbox" && arrInp[i].checked==true){                                          
            idTmp+=arrInp[i].value + ',';                   
        }
    }
 if(idTmp.indexOf(',')==-1)
 {
     alert('没有选中任何项~');
     return false;
 }else
 { 
        if(confirm('确定要删除当前选择的文档吗?')){  
            alert(idTmp);                       
//            form1.action=path+"?id="+idTmp;
//            form1.submit();          
        }
 }
 return false;
}