getOpacity return string instead of float in InternetExplorer

[nxpthx]

The getOpacity function might - in some cases - return a string instead of a float (or integer).

In case a 3rd party library - f.e. script.aculo.us - uses the return value to calculate and set a new value. In case a string is returned "1" - 0.3 results in a faulty opacity value of -0.3.

By adding floatval() to the function getOpacity (around line 3149) the issue can be fixed.

  function getOpacity(element) {
    return parseFloat(Element.getStyle(element, 'opacity'));
  }

Credits go to Jigal van Hemert for fixing it for the TYPO3 Project.

• issue: http://forge.typo3.org/issues/58053
• solution: https://review.typo3.org/29578