//Title Validation.js
//Author : Harish Chauhan
//Date   : 27 Jan, 2005
//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;
	}
// 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)
	{
  		 if ((str.length==0)||(str==null))
			return true;
		 return false;
	}
// End of is_empty Function
	
//  this function checks the given option is checked or not
//  and return true or false accordingly.
	function is_checked(radio)
	{
		checked=false;
		for(i=0;i<radio.length;i++)
		{
			if(radio[i].checked)
			{
				checked=true;
				break;
			}
		}
		return checked;
	}
// End of is_checked 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