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<!DOCTYPE html>
<html>
<head>
</head>
<body>
  
  <table cellpadding='5' border='1' style="text-align:center; color:#ffffff; background-color:#444444; font-family:arial; font-size:14px">
   <tr>
      <td><b>Character</b></td>
      <td><b>Strength</b></td>
      <td><b>Spending Bonus</b></td>
   </tr>
    <tr>
      <td>Alexander</td>
      <td>
        <input 
        id="AlexanderStrengthVal" 
        type="text" value="60" 
        style="width:30px; border:none; color:#ffffff; background-color:transparent; text-align:center" 
        onfocus="this.blur()" 
        onClick="add(Alexander, 'Strength')" 
        onContextMenu="subtract(Alexander, 'Strength');"   
        />
      </td>
​
      <td>
        <input 
        id="AlexanderRemainingBonusVal" 
        type="text" 
        value="30" 
        style="width:30px; border:none; color:#ffffff; background-color:transparent; text-align:center" 
        />
      </td>
      
    </tr>
  </table>
</body>
</html>
 
var Alexander = 
     {
      Strength: "AlexanderStrengthVal",
      Bonus: "AlexanderRemainingBonusVal",
      Limits: {
        Strength: 60,
              }
    };
​
function add(character, stat)
{
  var txtNumber = document.getElementById(character[stat]);
  var newNumber = parseInt(txtNumber.value) + 1;
  var BonusVal = document.getElementById(character["Bonus"]);
  if(BonusVal.value == 0) return;
  var newBonus = parseInt(BonusVal.value) - 1;
  BonusVal.value = newBonus; 
  txtNumber.value = newNumber;
}
​
function subtract(character, stat)
{
  var txtNumber = document.getElementById(character[stat]);
  var newNumber = parseInt(txtNumber.value) - 1;
  if(newNumber < character.Limits[stat]) return;
    var BonusVal = document.getElementById(character["Bonus"]);
  var newBonus = parseInt(BonusVal.value) + 1;
  BonusVal.value = newBonus; 
  txtNumber.value = newNumber;
}
​
Output

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