function onOpen() {
SpreadsheetApp.getUi()
.createMenu("Shorten")
.addItem("Go !!","rangeShort")
.addToUi()
}

function rangeShort() {
var range = SpreadsheetApp.getActiveRange(), data = range.getValues();
var output = [];
for(var i = 0, iLen = data.length; i < iLen; i++) {
var url = UrlShortener.Url.insert({longUrl: data[i][0]});
output.push([url.id]);
}
range.offset(0,1).setValues(output);
}