function isemail(str)
{
  var regexp = /([a-zA-Z0-9._-]+@[a-zA-Z0-9._-]+\.[a-zA-Z0-9._-]+)/;
  return regexp.test(str);
}
function isChar(field)
{
 
	var valid = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ ."
	var ok = "yes";
	var temp;
	for (var i=0; i<field.length; i++) 
	{
		temp = "" + field.substring(i, i+1);
		if (valid.indexOf(temp) == "-1") ok = "no";
	}

	if (ok == "no") 
	{
   		return false;
	}
	else
	{
  		return true;
	}
}

function isphno(str)
{
	var regexp = /^(\d{11}|\d{3}-\d{1}-\d{7})$/;
	return regexp.test(str);
}
function isdate(str)
{
  var regexp = /([0-9]+\/[0-9]+\/[0-9]+)/;
  return regexp.test(str);
}
function imgchk(imgstr) {
	var imgname=new String(imgstr);
	var len=imgname.length;
	extn=imgname.substr(len-4,4);
	extn1=imgname.substr(len-5,5);
	
	if ((extn!=".gif")&&(extn!=".jpg")&&(extn1!=".jpeg"))
	{
		return false;
	}
	return true;
}

/**************************************************************
 ReverseString: Returns a string in which the character order 
                of a specified string is reversed

 Parameters:
      Expression = The expression argument is the string whose 
                   characters are to be reversed. If expression 
                   is a zero-length string (""), a zero-length 
                   string is returned. If expression is null,
                   false is returned.

 Returns: String
***************************************************************/
function ReverseString(Expression)
{
	if (Expression == null)
		return (false);

    var dest = '';
    for (var i = (Expression.length - 1); i >= 0; i--)
		dest = dest + Expression.charAt(i);
    return dest;
}



/**************************************************************
 Split: Returns a zero-based, one-dimensional array containing 
        a specified number of substrings

 Parameters:
      Expression = String expression containing substrings and 
                   delimiters. If expression is a zero-length 
                   string(""), Split returns an empty array, 
                   that is, an array with no elements and no 
                   data.
      Delimiter  = String character used to identify substring 
                   limits. If delimiter is a zero-length 
                   string (""), a single-element array 
                   containing the entire expression string 
                   is returned.

 Returns: String
***************************************************************/
function Split(Expression, Delimiter)
{
	var temp = Expression;
	var a, b = 0;
	var array = new Array();

	if (Delimiter.length == 0)
	{
		array[0] = Expression;
		return (array);
	}

	if (Expression.length == '')
	{
		array[0] = Expression;
		return (array);
	}

	Delimiter = Delimiter.charAt(0);

	for (var i = 0; i < Expression.length; i++) 
	{
		a = temp.indexOf(Delimiter);
		if (a == -1)
		{
			array[i] = temp;
			break;
		}
		else
		{
			b = (b + a) + 1;
			var temp2 = temp.substring(0, a);
			array[i] = temp2;
			temp = Expression.substr(b, Expression.length - temp2.length);
		}
	}

	return (array);
}

/**************************************************************
 LTrim: Returns a String containing a copy of a specified 
        string without leading spaces 

 Parameters:
      String = The required string argument is any valid 
               string expression. If string contains null, 
               false is returned

 Returns: String
***************************************************************/
function LTrim(String)
{
	var i = 0;
	var j = String.length - 1;

	if (String == null)
		return (false);

	for (i = 0; i < String.length; i++)
	{
		if (String.substr(i, 1) != ' ' &&
		    String.substr(i, 1) != '\t')
			break;
	}

	if (i <= j)
		return (String.substr(i, (j+1)-i));
	else
		return ('');
}

/**************************************************************
 RTrim: Returns a String containing a copy of a specified 
        string without trailing spaces 

 Parameters:
      String = The required string argument is any valid 
               string expression. If string contains null, 
               false is returned

 Returns: String
***************************************************************/
function RTrim(String)
{
	var i = 0;
	var j = String.length - 1;

	if (String == null)
		return (false);

	for(j = String.length - 1; j >= 0; j--)
	{
		if (String.substr(j, 1) != ' ' &&
			String.substr(j, 1) != '\t')
		break;
	}

	if (i <= j)
		return (String.substr(i, (j+1)-i));
	else
		return ('');
}

/**************************************************************
 RTrim: Returns a String containing a copy of a specified 
        string without both leading and trailing spaces 

 Parameters:
      String = The required string argument is any valid 
               string expression. If string contains null, 
               false is returned

 Returns: String
***************************************************************/
function Trim(String)
{
	if (String == null)
		return (false);

	return RTrim(LTrim(String));
}