How ignore the input when starts with 0?

[Imagine Programming]

String.TrimLeft(szInputString, "0 ");

This will trim 0's and spaces from the left.

[gutierrez100]

How ignore the input when starts with 0?

Eg: if I put 23 or 023 or 00023 the function goes to page 23.
I'm using input box with mask #####

-- search box
function boxSearch()
	idBox = Input.GetText("box_search");
	idToNumber = String.ToNumber(idBox);
	pnToNumber = String.ToNumber(page_name);

	if pnToNumber == idToNumber then
		Dialog.Message("Attention!", "The page is already active!", 0, 64, 0);
		Page.SetFocus("box_search");
	end

	Page.Jump(""..idToNumber.."");

	if idToNumber ~= "" then
		Dialog.Message("Error!", "ID not found!", 0, 64, 0);
		Page.SetFocus("box_search");
	end
end