function del(){
	
	Numbers = 0;
	var delboxs = document.getElementsByName("delbox");
	 for(i=0 ; i < delboxs.length ; i++){
		if(delboxs[i].checked){
			Numbers ++;
			break;
		}
	}
	
	if(Numbers == 0){
		alert("請至少選擇一項！");
	}
	else{
		var m = confirm("你確定要刪除這些用戶嗎？");
		if(m){
			document.SLForm.submit();
		}
	}	
}