//Title Validation.js

//Author : Harish Chauhan

//Date   : 24 Aug,2004

//This file contains the functions for input data validation

//at client side with the help of java script.

//  this function checks the email format is correct or not

//  and return true or false accordingly.

	function is_email(email)

	{

		if(!email.match(/^[A-Za-z0-9\._\-+]+@[A-Za-z0-9_\-+]+(\.[A-Za-z0-9_\-+]+)+$/))

			return false;

		return true;

	}

// End of is_email Function

//  this function checks the given number is signed/unsigned number

//  and return true or false accordingly.

	function is_number(number)

	{

		if(!number.match(/^[\-\+0-9e1-9]+$/))

			return false;

		return true;

	}

// End of is_number Function

//  this function checks the given number is unsigned number

//  and return true or false accordingly.

	function is_unsign_number(number)

	{

		if(!number.match(/^[\+0-9]+$/))

			return false;

		return true;

	}

	function is_double(number)

	{

		if(!number.match(/^[0-9]*\.?[0-9]*$/))

			return false;

		return true;

	}

// End of is_unsign_number Function

	

//  this function checks the given string is alphanumeric word or not

//  and return true or false accordingly.

	function is_alpha_numeric(str)

	{

		if(!str.match(/^[A-Za-z0-9 ]+$/))

			return false;

		return true;

	}

// End of is_alpha_numeric Function

//  this function checks the given string is empty or not

//  and return true or false accordingly.

	function is_empty(str)

	{

  		 str=trim(str);

		 if ((str.length==0)||(str==null))

			return true;

		 return false;

	}

// End of is_empty Function

	

	function trim(inputString) 

	{

	   // Removes leading and trailing spaces from the passed string. Also removes

	   // consecutive spaces and replaces it with one space. If something besides

	   // a string is passed in (null, custom object, etc.) then return the input.

	   if (typeof inputString != "string") { return inputString; }

	   var retValue = inputString;

	   var ch = retValue.substring(0, 1);

	   while (ch == " ") { // Check for spaces at the beginning of the string

		  retValue = retValue.substring(1, retValue.length);

		  ch = retValue.substring(0, 1);

	   }

	   ch = retValue.substring(retValue.length-1, retValue.length);

	   while (ch == " ") { // Check for spaces at the end of the string

		  retValue = retValue.substring(0, retValue.length-1);

		  ch = retValue.substring(retValue.length-1, retValue.length);

	   }

	   while (retValue.indexOf("  ") != -1) { // Note that there are two spaces in the string - look for multiple spaces within the string

		  retValue = retValue.substring(0, retValue.indexOf("  ")) + retValue.substring(retValue.indexOf("  ")+1, retValue.length); // Again, there are two spaces in each of the strings

	   }

	   return retValue; // Return the trimmed string back to the user

	} // Ends the "trim" function

	function is_date(d)

	{

		if(d.search(/^(\d){1,2}[-\/\\](\d){1,2}[-\/\\]\d{4}$/)!=0)

			return -1;//Bad Date Format

		var T = d.split(/[-\/]/);

		var M = T[0];

		var D = T[1];

		var	Y = T[2];

		return D>0 && (D<=[,31,28,31,30,31,30,31,31,30,31,30,31][M] ||	D==29 && Y%4==0 && (Y%100!=0 || Y%400==0) ) 

	}