/*
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);
}

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;
		}
	}	
}

function addproduct(productid){
	with (window.document.frmProductlist) {
		window.location.href = 'cart.php?action=add&p=' + productid + '&qui=' + txtQuantity.value; //+'quan=' + rquantity.options[rquantity.selectedIndex].value;
	}
}
function zipcode(textBox){
	var cquantity;
	with (window.document.frmProductlist){
		cquantity = txtQuantity;
	}
	cquantity.value = textBox. value;
}