/*
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 IsNumeric(sText) {
   var ValidChars = "0123456789.-";
   var IsNumber=true;
   var Char;

   for (i = 0; i < sText.length && IsNumber == true; i++) 
      { 
      Char = sText.charAt(i); 
      if (ValidChars.indexOf(Char) == -1) 
         {
         IsNumber = false;
         }
      }
   return IsNumber;
}
/*	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;
		}
	}	
}

/* Check Valid email */
function checkEmail(formElement) {
		formElement.value = trim(formElement.value);
	_isEmpty = true;
if (/^\w+([\.-]?\w+)*@\w+([\.-]?\w+)*(\.\w{2,3})+$/.test(formElement.value)){
	_isEmpty = false;
} else {
formElement.focus();
alert("Invalid E-mail Address! Please re-enter.");
 }
 return _isEmpty;
}