function valForm()
{
	var bAnyChecked = false;
	
	if (document.QueryForm.chkName.checked)
	{
		bAnyChecked = true;
		if (document.QueryForm.txtName.value == "")
		{
			alert("Please enter Shop Name !")
			document.QueryForm.txtName.focus();
			return false;
		}
		if (document.QueryForm.txtName.value.length < 3)
		{
			alert("Please enter at least 3 charactors!")
			document.QueryForm.txtName.focus();
			return false;
		}
	}
	if (document.QueryForm.chkUnit.checked)
	{
		bAnyChecked = true;
		if (!isNumeric(document.QueryForm.txtUnit1.value) || !isNumeric(document.QueryForm.txtUnit2.value))
		{
			alert("Please enter a valid Unit number !")
			document.QueryForm.txtUnit1.focus();
			return false;
		}
	}
	if (document.QueryForm.chkTrade.checked)
	{
		bAnyChecked = true;
	}
	
	if (bAnyChecked == false)
		{
			alert("Please check at least one critic to search !")
			document.QueryForm.chkName.focus();
			return false;
		}

	
	return true;
};

function isNumeric(s)
{
	if (s.length == 0)
		return false;
		
	for(i=0; i<s.length; i++)
	{
		if ((s.charAt(i)<"0") || (s.charAt(i)>"9"))
			return false;
	}

	return true;
}