//left trim
function ltrim( s ){return s.replace( /^\s*/, "" );}

//right trim
function rtrim( s ){return s.replace( /\s*$/, "" );}

//trim left & right
function trim( s ){return rtrim(ltrim(s));}

//is null or not
function isNull( s ){return (trim(s).length<1);}

function IsEmail(str)
{
	var regexp=/^[\w-]+(\.*[\w-]+)*@([0-9a-z]+(([0-9a-z]*)|([0-9a-z-]*[0-9a-z]))+\.)+[a-z]{2,3}$/i;
	return regexp.test(str);
}

//发送
function checkSend(form) {
	if (isNull(form.vc_author.value)
		|| isNull(form.vc_email.value)
		|| isNull(form.vc_title.value)
		|| isNull(form.t_content.value)
		// || isNull(form.vc_telphone.value)
		|| isNull(form.ColumnID.value))
	{
		alert("提示：所有标记（*）的字段都必须填写!");
		return false;
	}
	else if(!IsEmail(form.vc_email.value))
	{
		alert("提示：电子邮件格式不正确!");
		form.vc_email.focus();
		return false;
	}
	else
	{
		return true;
	}
}

/**
* 翻页
*  currentpage 当前页码
*  infoid 信息ID
*  colid 类别ID
*/
function goPage( currentpage ,webid ,columnid)
{
    //columnid=(columnid.length<1)?"0":"columnid";
	var formData = "guestbook.jsp?strWebID="+webid+"&current="+currentpage+"&ColumnID="+columnid;
	location.href = formData;
}

/**
*  上10页
*  currentpage 当前页码
*  infoid 信息ID
*  colid 类别ID
*/
function goPrePage( currentpage ,webid ,columnid)
{
	var page = Math.ceil( currentpage/10 ) ;
	currentpage = (page-1)*10;
	var formData = "guestbook.jsp?strWebID="+webid+"&current="+currentpage+"&ColumnID="+columnid ;
	location.href = formData;
}

/**
*  下10页
*  currentpage 当前页码
*  infoid 信息ID
*  colid 类别ID
*/
function goNextPage( currentpage ,webid ,columnid)
{
	var page =  Math.ceil( currentpage/10 ) ;
	currentpage = (page+1)*10;		
	var formData = "guestbook.jsp?strWebID="+webid+"&current="+currentpage+"&ColumnID="+columnid ;
	location.href = formData;
}

function checkReSend(form) {	
	if (isNull(form.vc_author.value)
		|| isNull(form.vc_email.value)
		|| isNull(form.t_content.value) )
	{
		alert("提示：所有标记（*）的字段都必须填写!");
		return false;
	}
	else if(!IsEmail(form.vc_email.value))
	{
		alert("提示：电子邮件格式不正确!");
		form.vc_email.focus();
		return false;
	}
	else
	{
		return true;
	}
}