Haven't tested this to see if it works, but you could try -
function ff_integeramount(element, message)
{
var ex = /(^-?\d\d*$)/;
if ((!ex.test(element.value)) && ((element.value)<3)) {
if (message=='') message = element.name+" \n";
ff_validationFocus(element.name);
return message;
} // if
return '';
} // ff_integeramount