//判断多选框有没有被选中
function IsDelete(form)
{
	var j = 0;
    var obj = form.elements;
    for(i=0;i<obj.length;i++)
    {
        if(obj[i].type=="checkbox" && obj[i].checked &&obj[i].Name != "chkAll")
        {         
          	j = j+1  
        }
    }
	if(j>0)
	{
		return confirm("系统提示：\n\n确定要删除指定的记录吗？");
	}
	else{
		alert("系统提示：\n\n请选取删除记录!");
    	return false;
	}
}

//确认删除操作
function IsEnter() {
	if (confirm("系统提示：\n\n确定要继续操作吗？")){
		return true;
	}
	return false;	
}
//Ctrl键+Enter键提交 onclick="CtrlEnter(this.form)"
function CtrlEnter(form){
	if(event.ctrlKey && window.event.keyCode==13){
		this.document.form.submit();
	}	
}

//全选复选框
function CheckboxAll(form)
{
  for (var i=0;i<form.elements.length;i++)
    {
    var e = form.elements[i];
    if (e.Name != "chkAll")
       e.checked = form.chkAll.checked;
    }
}

//验证一个表单
function IsInput(obj,msg){
	var objID = document.getElementById(obj).value;
	if(objID==""){
		alert("系统提示：\n\n"+ msg + "不能为空！");
		return false;
	}
	return true;
}
//下拉框选择图片
function SelectImage(image,objID){
	var Obj=document.getElementById(objID);
	var Img = Obj.options[Obj.selectedIndex].value;
	if(Img==""){
		document.getElementById(image).style.visibility="hidden";
	}else{
		document.getElementById(image).style.visibility="visible";
		document.getElementById(image).src = Img;
	}
}

//显示无模式对话框,无返回值
function OpenWin(url,width,height){
	var arr = showModalDialog(url, window, "dialogWidth:" + width + "px;dialogHeight:" + height + "px;help:no;scroll:no;status:no");
	return false;
}
//是否有效的扩展名 var sAllowExt ="gif|jpg|jpeg";
function IsExt(url, opt){
	var sTemp;
	var b=false;
	var s=opt.toUpperCase().split("|");
	for (var i=0;i<s.length ;i++ ){
		sTemp=url.substr(url.length-s[i].length-1);
		sTemp=sTemp.toUpperCase();
		s[i]="."+s[i];
		if (s[i]==sTemp){
			b=true;
			break;
		}
	}
	return b;
}