function pinglungcheack(){
	var form=document.bookform;
	
	if (form.b_name.value.replace(/ /g,"")==""){
		alert("姓名不能为空,请填写你的姓名");
		form.b_name.focus();
		return false;
		}
		else if (form.b_name.value.replace(/ /g,"").length<2){
		alert("姓名太短了");
		form.b_name.focus();
		return false;
		}
		else if (form.b_name.value.replace(/ /g,"").length>10){
		alert("姓名太长了");
		form.b_name.focus();
		return false;
		}
		
	if (form.b_qq.value.replace(/ /g,"").length>12){
		alert("qq太长了");
		form.b_qq.focus();
		return false;
		}
		
	if (form.b_email.value.replace(/ /g,"").length>30){
		alert("email太长了");
		form.b_email.focus();
		return false;
		}
		
	if (form.b_conter.value.replace(/ /g,"")==""){
		alert("留言内容不能为空");
		form.b_conter.focus();
		return false;
		}
		else if (form.b_conter.value.replace(/ /g,"").length < 4){
		alert("留言内容太少了吧，你这是刷屏的吗？\n\n呵呵，请重新输入你的留言。");
		form.b_conter.focus();
		return false;
		}
		else if (form.b_conter.value.replace(/ /g,"").length > 1000){
		alert("留言内容太多了");
		form.b_conter.focus();
		return false;
		}

	if (form.yianzhen.value.replace(/ /g,"")==""){
		alert("验证码不能为空");
		form.yianzhen.focus();
		return false;
		}
		else if (isNaN(form.yianzhen.value.replace(/ /g,""))){
		alert("验证码必须为数字，请重新输入验证码");
		form.yianzhen.focus();
		return false;
		}
					
return true;				
}


function grin(tagname,tag) {
        var myField;
        if (document.getElementById(tagname) && document.getElementById(tagname).type == 'textarea') {
                myField = document.getElementById(tagname);
        }
        else {
                return false;
        }
        if (document.selection) {
                myField.focus();
                sel = document.selection.createRange();
                sel.text = tag;
                myField.focus();
        }
        else if (myField.selectionStart || myField.selectionStart == '0') {
                var startPos = myField.selectionStart;
                var endPos = myField.selectionEnd;
                var cursorPos = endPos;
                myField.value = myField.value.substring(0, startPos)
                                          + tag
                                          + myField.value.substring(endPos, myField.value.length);
                cursorPos += tag.length;
                myField.focus();
                myField.selectionStart = cursorPos;
                myField.selectionEnd = cursorPos;
        }
        else {
                myField.value += tag;
                myField.focus();
        }
}

function getObject(objectId) {
    if(document.getElementById && document.getElementById(objectId)) {
	return document.getElementById(objectId);
    } else if (document.all && document.all(objectId)) {
	return document.all(objectId);
    } else if (document.layers && document.layers[objectId]) {
	return document.layers[objectId];
    } else {
	return false;
    }
}