How to go to a specific row or cell or to the 1st empty row in a Google sheet

GotoCellOrRow.js

function onOpen()
{
  var menuEntries = [{name: "Go to Cell", functionName: "goToCell"}, {name: "Go to Row", functionName: "goToRow"},{name: "Go to 1st empty Row", functionName: "selectFirstEmptyRow"}];
  SpreadsheetApp.getActiveSpreadsheet().addMenu("MyUtils", menuEntries);
}

function goToCell()
{
  var strRange = Browser.inputBox("Insert the required cell (e.g.: B351):", Browser.Buttons.OK_CANCEL);
  if(strRange != "cancel")
  {
    try
    {
      SpreadsheetApp.getActiveSheet().getRange(strRange).activate();
    }
    catch(e) {Browser.msgBox(e.message);}
  }
}

function goToRow()
{
  var strRange = Browser.inputBox("Insert the required row number (e.g.: 132):", Browser.Buttons.OK_CANCEL);
  if(strRange != "cancel")
  {
    try
    {
      strRange = "A" + strRange
      SpreadsheetApp.getActiveSheet().getRange(strRange).activate();
    }
    catch(e) {Browser.msgBox(e.message);}
  }
}

function selectFirstEmptyRow() {
  var sheet = SpreadsheetApp.getActiveSpreadsheet();
  sheet.setActiveSelection(sheet.getRange("A"+getFirstEmptyRowWholeRow()))
}

function getFirstEmptyRowWholeRow() {
  var sheet = SpreadsheetApp.getActiveSheet();
  var range = sheet.getDataRange();
  var values = range.getValues();
  var row = 0;
  for (var row=0; row<values.length; row++) {
    if (!values[row].join("")) break;
  }
  return (row+1);
}

Click here to learn how to go to the first empty row a Google sheet:

Click here to learn how to add a button which triggers a Google script.