title: Add/Subtract Selected Value from Integer
body: <p>I'm quite new to jquery. I've made extensive use of what i've been able to find and understand. However, i'm not sure at all how to tackle this particular problem.</p>
  
  <p>I have an integer that manifests as a DOM string in html. Using Jquery, i've set up a contextual menu that displays the numbers +1->+10, and -1->-10. I'm looking for a way to add/subtract the value of an entry of the contextual menu, from the initial integer. </p>
  
  <p>For example, i have the initial integer 100, i right click on it, revealing the contextual menu. I go to the -5, and click it. The integer changes to 95.</p>