function $(element)
{
	return YAHOO.util.Dom.get(element);
}

function cleardiv(element)
{
	$(element).innerHTML = '';
}

function in_array(_var, _array)
{
	for(i in _array)
	{
		if(_var == _array[i])
		{
			return true;
		}
	}
	return false;
}

function LTrim(str)
{
	var mask=new String(" \t\n\r");
	var s=new String(str);
	if(mask.indexOf(s.charAt(0))!=-1)
	{
		var j=0,i=s.length;
		while(j<i&&mask.indexOf(s.charAt(j))!=-1)
		{
			j++;
		}
		s=s.substring(j,i);
	}
	return s;
}


function RTrim(str)
{
	var mask=new String(" \t\n\r");
	var s=new String(str);
	if(mask.indexOf(s.charAt(s.length-1))!=-1)
	{
		var i=s.length-1;
		while(i>=0&&mask.indexOf(s.charAt(i))!=-1)
		{
			i--;
		}
		s=s.substring(0,i+1);
	}
	return s;
}

//Trim
function Trim(str)
{
	return RTrim(LTrim(str));
}


function checkISBN(_1c)
{
return !/(?=.{13}$)\d{1,5}([-])\d{1,7}\1\d{1,6}\1(\d|X|x)/.test(_1c);
}
function checkNum(str)
{
return !/\D/.test(str);
}
function isValidDate(str){
return /^(\d{1,4})(-|\/)(\d{2})\2(\d{2})$/.test(str);
}


//
function isEmail(_1f){
if(_1f.length==0){
alert("\u8bf7\u586b\u5199\u7535\u5b50\u90ae\u4ef6\u5730\u5740\uff0c\u5426\u5219\u6211\u4eec\u5c06\u65e0\u6cd5\u4e0e\u60a8\u8054\u7cfb\u3002");
return false;
}
var _20=/^([a-zA-Z0-9_\.\-])+\@(([a-zA-Z0-9\-])+\.)+([a-zA-Z0-9]{2,4})+$/;
if(!_20.test(_1f)){
alert("\u62b1\u6b49\uff0c\u7535\u5b50\u90ae\u7bb1\u683c\u5f0f\u4e0d\u5bf9\u6216\u8005\u5305\u542b\u4e0d\u5408\u6cd5\u5b57\u7b26");
return false;
}
return true;
}