Convenience function. Return str iff browser version is
>= optional argument minVersion and <= optional argument maxVersion.
Else return "". Useful when concatenating long strings to write out.
function sv(str, minVersion, maxVersion) { if ( ((sv.arguments.length < 3) || (is.major <= maxVersion)) && ((sv.arguments.length < 2) || (is.major >= minVersion))) return str; else return ""; }