if (typeof $ =='undefined')
{
	$ = function(id)
	{
		return document.getElementById(id);
	}
}

//检查是否数字
function isNumber(obj)
{
    if(obj.search("^-?\\d+(\\.\\d+)?$") != 0)
	{
        return false;
    }
	else
	{
		return true;
	}
}

function checkEmail(obj)
{
	var filter=/^\s*([A-Za-z0-9_-]+(\.\w+)*@(\w+\.)+\w{2,3}){0,40}\s*$/;
	if (!filter.test(obj))
	{
		return false;
	}
	else
	{
		return true;
	}
}

function checkChinese(str)
{
	var len=0;
	for(var i=0;i<str.length;i++)
	{
		if   ( str.charCodeAt(i)>127 || str.charCodeAt(i)==94 )
		len+=1;
	}
	if ( len > 0 )
	return false;
	else
	return true;
}

function calculate_byte( sTargetStr )
{
	var sTmpStr, sTmpChar;
	var nOriginLen = 0;
	var nStrLength = 0;

	sTmpStr = new String(sTargetStr);
	nOriginLen = sTmpStr.length;

	for ( var i=0 ; i < nOriginLen ; i++ )
	{
		sTmpChar = sTmpStr.charAt(i);

		if (escape(sTmpChar).length > 4)
		{
				nStrLength += 2;
		}
		else if(sTmpChar!='\r')
		{
				nStrLength ++;
		}
	}

	return nStrLength;
}

function rRDelsure(errStr)
{
	var box=window.confirm("提示：\n\n"+errStr);
	if(box)
	{
		return true;
	}
	else
	{
		return false;
	}
}

/**
 * 复选框全选
 */
function selectAll(obj, chk)
{
  if (chk == null)
  {
    chk = 'checkboxes';
  }

  var elems = obj.form.getElementsByTagName("INPUT");

  for (var i=0; i < elems.length; i++)
  {
    if (elems[i].name == chk || elems[i].name == chk + "[]")
    {
      elems[i].checked = obj.checked;
    }
  }
}

function selCheckboxes()
{
	var len = document.getElementsByName('checkboxes[]');
	var arr = new Array();
	var temp = '';
	for(var i = 0; i< len.length; i++)
	{
		if(len[i].checked == true)
		{
			temp += len[i].value + ',';

		}
	}
	temp = temp.substr(0, temp.length - 1);

	return temp;
}

function checkSearch(form)
{
	if(form){
		if(form.keyword.value == '' || form.keyword.value == '搜索成员' || form.keyword.value == '请输入关键字' || form.keyword.value == '图书、书评、小组、会员')
		{
			alert("请输入关键字！");
			form.keyword.focus();
			return false;
		}
	}else{
		if($("keyword").value == '' || $("keyword").value == '搜索成员' || $("keyword").value == '请输入关键字' || $("keyword").value == '图书、书评、小组、会员')
		{
			alert("请输入关键字！");
			$("keyword").focus();
			return false;
		}
	}
	return true;
}
function checkDriftSearch () {
	searchType = $('searchtype').value;
	switch(searchType) {
		case '1' :
			if($("key").value == '') {
				alert("请输入关键字！");
				$("key").focus();
				return false;
			}
			return true;
			break;
		case '2' :
			if($("bookkey").value == '') {
				alert("请输入关键字！");
				$("bookkey").focus();
				return false;
			}
			var len = document.getElementsByName('bookarea[]');
			for(var i = 0; i< len.length; i++)
			{
				if(len[i].checked == true)
				{
					return true;
				}
			}
			alert("请选择搜索范围！");
			return false;
			break;
		case '3' :
			if($("province").value == '') {
				alert("请选择所在省份！");
				return false;
			}
			if($("city").value == '') {
				alert("请选择所在城市！");
				return false;
			}
			if($("area").value == '') {
				alert("请选择所在地区！");
				return false;
			}
			return true;
			break;
		case '4' :
			if($("school").value == 'none') {
				alert("请选择学校！");
				return false;
			}
			return true;
			break;
		default :
			return false;
	}
}
function checkSmallSearch() {
	if($("smallsearch").value == '') {
		alert("请输入搜索关键字！");
		return false;
	}
	return true;
}
function checkDriftThemeSearch() {
	if($("key").value == '') {
		alert("请输入搜索关键字！");
		return false;
	}
	if($("bySearch").value == 'none') {
		alert("请选择搜索方式！");
		return false;
	}
	return true;
}
function clear_value(id, value)
{
	if (document.getElementById(id).value == value)
	{
		document.getElementById(id).value = '';
	}
}

function reset_value(id, value)
{
	if (document.getElementById(id).value == '')
	{
		document.getElementById(id).value = value;
	}
}

function search_fc()
{
	if(document.getElementById('search_btn').style.display == 'none')
	{
		document.getElementById('search_btn').style.display = 'block';
		document.getElementById('search_arrow').style.background = 'url(images/common/arrow02.gif)';
		document.getElementById('search_arrow').title = '收起';
	}else{
		document.getElementById('search_btn').style.display = 'none';
		document.getElementById('search_arrow').style.background = 'url(images/common/arrow01.gif)';
		document.getElementById('search_arrow').title = '展开';
	}
}
function changeSearch(str) {
    if (str == 'book') {
        document.getElementById('search_action').value = 'book';
        document.getElementById('search_submit').value = '图 书';
    } else if(str == 'review') {
        document.getElementById('search_action').value = 'review';
        document.getElementById('search_submit').value = '书 评';
    } else if(str == 'group') {
        document.getElementById('search_action').value = 'group';
        document.getElementById('search_submit').value = '小 组';
    }
    document.getElementById('search_btn').style.display = 'none';
}