function deleteAllOptions(sel){sel.options.length=0;}

function checkCols(){
	var strid = $("select")[1].options[$("select")[1].selectedIndex].value*1;
	if (strid==0){
		fillSel("請選擇...",$("select")[2]);
		$("span")[0].innerHTML="";
	}else{
		postCols(strid);

	}
}	

function postCols(Col_id){
	var xmlhttp;
	try{
		xmlhttp=new XMLHttpRequest();
		}
	catch(e){
		xmlhttp=new ActiveXObject("Microsoft.XMLHTTP");
		}
	xmlhttp.onreadystatechange=function(){
	if (xmlhttp.readyState==4){
		if (xmlhttp.status==200){
			var data=xmlhttp.responseText;
			id_result(data);	
			}
		else{
			fillSel("文件傳輸失敗！",$("select")[2]);
			$("span")[0].innerHTML="<img src='../images/reg_yesno.gif' alt='文件傳輸失敗！'>";
			}
		}
	else{
		fillSel("正在刷新...",$("select")[2]);
		$("span")[0].innerHTML="<img src='images/loading.gif' alt='正在刷新專業下拉列表......'>";
		}
	}
	var BaseURL="admin_res_check.asp"
	var url = BaseURL + "?timeStamp=" + new Date().getTime();
	xmlhttp.open("post", url, true);
	xmlhttp.setRequestHeader('Content-type','application/x-www-form-urlencoded; charset=gb2312');
	xmlhttp.send("Col_id="+escape(Col_id));	
}
function id_result(data){	
	var pronames
	var data_arr
	if(data!="0"){
		data = data.split('%%');
			$("select")[2].options.length=0;
			$("select")[2].options[0] = new Option("請選擇...","0");
			for(data_i=0;data_i<data.length;data_i++){
				data_arr=data[data_i];
				data_arr=data_arr.split('||');
				$("select")[2].options[data_i+1] = new Option(data_arr[1],data_arr[0]);
				}
			$("select")[2].selectedIndex = data_i;
			setSel2(0,$("select")[2])
		$("span")[0].innerHTML="<img src='../images/reg_yesok.gif' alt='專業下拉列表更新成功！'>";
		checkcourses();
	}else{
		fillSel("當前還沒有專業",$("select")[2]);
		$("span")[0].innerHTML="<img src='../images/reg_yesno.gif' alt='專業下拉列表為空，請添加專業！'>";
	}
}


//$div
//formToRequestString
//ajaxLoadPage
//ajaxFormSubmit
function change(v){
	 var nowvalue=$sel(s[v*1-1]).value*1;
	if (nowvalue>0){
		postinfos(s[v-1]+"="+nowvalue,"admin_res_check.asp",s[v-1],s[v]);
	}else{
		for(i=v;i<s.length;i++){
			fillSel("請選擇...",$val(s[i]));
			$div(s[i]).innerHTML="";

		}
	}
}