title: Add button to update Google Spreadsheet. Increment cell and update another cell with current date
body: <p>We have spreadsheet that has a list of members at our gym facility. What we would like to incorporate is a way that a coach could walk around with an iPad and click a button that would "check-in" our members. Usually the number of members present is small - maybe 20-30 members per class. But, we want a way to try to have coach accountability so if someone doesn't show up for 3 weeks, we can reach out in an email to inquire where they have been.</p>
  
  <p>I've created a test spreadsheet that should be editable. I need some help with recommendations or writing a script that would perform the following:</p>
  
  <p>What I would like is a button in the far left "check-in" column next to every member name that our coaches could click when they are present. What that would do would add +1 to the "total check-ins" column and also update the "last time checked-in" column with the current date/time stamp.</p>
  
  <p><a href="https://docs.google.com/spreadsheet/ccc?key=0AnGxNda7E77DdHZldlhQY2hZZlNJamZ6VTZ0WUhqZXc&amp;usp=sharing" rel="nofollow">https://docs.google.com/spreadsheet/ccc?key=0AnGxNda7E77DdHZldlhQY2hZZlNJamZ6VTZ0WUhqZXc&amp;usp=sharing</a></p>
  
  <p>I'm brand new to scripting in Google Docs, so thanks in advance for any expertise that is offered! MUCH appreciated!</p>