function checkEmail(emailStr)
{
	if (emailStr.length == 0)
    {
    	return true;
    }
	var emailPat=/^(.+)@(.+)$/;
	var specialChars="\\(\\)<>@,;:\\\\\\\"\\.\\[\\]";
	var validChars="\[^\\s" + specialChars + "\]";
	var quotedUser="(\"[^\"]*\")";
	var ipDomainPat=/^(\d{1,3})[.](\d{1,3})[.](\d{1,3})[.](\d{1,3})$/;
	var atom=validChars + '+';
	var word="(" + atom + "|" + quotedUser + ")";
	var userPat=new RegExp("^" + word + "(\\." + word + ")*$");
	var domainPat=new RegExp("^" + atom + "(\\." + atom + ")*$");
	var matchArray=emailStr.match(emailPat);
    if (matchArray == null)
    {
		return false;
    }
    var user=matchArray[1];
    var domain=matchArray[2];
    if (user.match(userPat) == null)
    {
    	return false;
    }
    var IPArray = domain.match(ipDomainPat);
    if (IPArray != null)
    {
    	for (var i = 1; i <= 4; i++)
        {
			if (IPArray[i] > 255)
            {
				return false;
            }
        }
        return true;
    }
    var domainArray=domain.match(domainPat);
    if (domainArray == null)
    {
    	return false;
    }
    var atomPat=new RegExp(atom,"g");
    var domArr=domain.match(atomPat);
    var len=domArr.length;
    if ((domArr[domArr.length-1].length < 2) || (domArr[domArr.length-1].length > 3))
    {
    	return false;
    }
    if (len < 2)
    {
    	return false;
    }
    return true;
}
function checkfloat(floatstr)
{
    var tempArray = floatstr.split('.');
    if(tempArray.length>2)
    {
        return false;
    }
    var joinedString= tempArray.join('');
    if (!isAllDigits(joinedString))
    {
		return false;
    }
    else
    {
		var iValue = parseFloat(floatstr);
        if (isNaN(iValue))
        {
        	return false;
        }
    }
    return true;
}

function isAllDigits(argvalue)
{
	argvalue = argvalue.toString();
    var validChars = "0123456789";
    var startFrom = 0;
    if (argvalue.substring(0, 2) == "0x")
    {
		validChars = "0123456789abcdefABCDEF";
		startFrom = 2;
    }
    else if (argvalue.charAt(0) == "0")
    {
		validChars = "01234567";
    	startFrom = 1;
    } else if (argvalue.charAt(0) == "-")
    {
		startFrom = 1;
    }

    for (var n = startFrom; n < argvalue.length; n++)
    {
		if (validChars.indexOf(argvalue.substring(n, n+1)) == -1) return false;
    }
    return true;
}

function checkDecimalNum(floatstr,num)
{
    var tempArray = floatstr.split('.');
    if(tempArray.length==2)
    {
    	if(tempArray[1].length<=2) return true;
    }
    return false;
}
function checkphone( phone )
{
    var Letters = "1234567890,-";
    for (i=0; i < phone.value.length; i++)
	{
        var CheckChar = phone.value.charAt(i);
        if (Letters.indexOf(CheckChar) == -1)
        {
            alert ("电话号码只能为数字或逗号(,)横折号(-)！");
            return false;
        }
   }
   return true;
}

function newcheckphone(phone)
{
    var Letters = "1234567890,.-=\~!@#$%^&*()_+|{}:<>?;'/";
    for (i=0; i < phone.value.length; i++)
	{
        var CheckChar = phone.value.charAt(i);
        if (Letters.indexOf(CheckChar) == -1)
        {
            return false;
        }
   }
   return true;
}
function checknumber( number )
{
    var Letters = "1234567890";
    for (i=0; i < number.value.length; i++)
	{
        var CheckChar = number.value.charAt(i);
        if (Letters.indexOf(CheckChar) == -1)
        {
            return false;
        }
   }
   return true;
}
function checkchar( letter )
{
  var Letters = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
  for (i=0; i < letter.value.length; i++)
  {
      var CheckChar = letter.value.charAt(i);
      CheckChar = CheckChar.toUpperCase();
      if (Letters.indexOf(CheckChar) == -1)
      {
          alert ("输入类型必须为英文！");
          return false;
      }
  }
}
function checksymbol(symbol)
{
    var Letters = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz.";
    for (i=0; i < symbol.value.length; i++)
	{
        var CheckChar = symbol.value.charAt(i);
        if (Letters.indexOf(CheckChar) == -1)
        {
            return false;
        }
   }
   return true;
}
function  jtrim(s)
{
    var  i;
    for(i=0;i<s.length;i++)
    {
        if(s.charAt(i)!=' ') return true;
    }
    return false;
}