/*
Strip whitespace from the beginning and end of a string
Input : a string
*/
function trim(str)
{
	return str.replace(/^\s+|\s+$/g,'');
}

/*
Make sure that textBox only contain number
*/
function checkNumber(textBox)
{
	while (textBox.value.length > 0 && isNaN(textBox.value)) {
		textBox.value = textBox.value.substring(0, textBox.value.length - 1)
	}
	
/*	textBox.value = trim(textBox.value);
	if (textBox.value.length == 0) {
		textBox.value = 0;		
	} else {
		textBox.value = parseInt(textBox.value);
	}
*/}

/*
	Check if a form element is empty.
	If it is display an alert box and focus
	on the element
*/
function isEmpty(formElement, message) {
	formElement.value = trim(formElement.value);
	
	_isEmpty = false;
	if (formElement.value == '') {
		_isEmpty = true;
		alert(message);
		formElement.focus();
	}
	
	return _isEmpty;
}

/*
	Set one value in combo box as the selected value
*/
function setSelect(listElement, listValue)
{
	for (i=0; i < listElement.options.length; i++) {
		if (listElement.options[i].value == listValue)	{
			listElement.selectedIndex = i;
		}
	}	
}

/* This script and many more are available free online at
The JavaScript Source!! http://javascript.internet.com
Created by: Justin Barlow | http://www.netlobo.com/ */

// This function formats numbers by adding commas
function numberFormat(nStr){
  nStr += '';
  x = nStr.split('.');
  x1 = x[0];
  x2 = x.length > 1 ? '.' + x[1] : '';
  var rgx = /(\d+)(\d{3})/;
  while (rgx.test(x1))
    x1 = x1.replace(rgx, '$1' + ',' + '$2');
  return x1 + x2;
}

// This function removes non-numeric characters
function stripNonNumeric( str ){
  str += '';
  var rgx = /^\d|\.|-$/;
  var out = '';
  for( var i = 0; i < str.length; i++ ){
    if( rgx.test( str.charAt(i) ) ){
      if( !( ( str.charAt(i) == '.' && out.indexOf( '.' ) != -1 ) ||
             ( str.charAt(i) == '-' && out.length != 0 ) ) ){
        out += str.charAt(i);
      }
    }
  }
  return out;
}