var spEmStepWidth = 0.125; // increase/decrease font every step by spEmStepWidth
var spEmBasis = 1; // font size of content at startup
var spEmStep = 0; // counter for current step (leave as 0)
var spEmMaxSteps = 2; // maximum steps alowed

/**
* spFontSizer increase/decrease font size inside "spEmStep"
*
* use: spFontSizer(1, false), spFontSizer(-1, false) or spFontSizer(0, true)
* @param spInc set to 1 or -1
* @param spReset set to true to get initial font size
*/

function spFontSizer(spInc, spReset) {
// reset font size
  if (spReset)
    spEmStep = -1;
    // inside allowed steps?
      if (Math.abs(spEmStep + spInc) <= spEmMaxSteps) {
      // increase/decrease spEmStep
      spEmStep += spInc;
      // set new font size for every tag inside "spEmStep"
      spEmFontSize = spEmStep * spEmStepWidth + spEmBasis;
      //get spArticleBody
      spEmBody = document.getElementById('content');
      // spEmBody = document.getElementsByTagName('body')[0];
      // set new fot size
      spEmBody.style.fontSize = spEmFontSize + "em";
      document.cookie = 'fontsize=' + spEmFontSize + ';'; 
      }
        if (spEmStep == -spEmMaxSteps) {
          document.getElementById("spFontsizeMinus").src = "/site-templates/detecon-dmr.21torr.com/img/btn_plus_minus_no.gif";
        }
        else if (spEmStep == spEmMaxSteps) {
          document.getElementById("spFontsizePlus").src = "/site-templates/detecon-dmr.21torr.com/img/btn_plus_minus_no.gif";
        }
        else {
          document.getElementById("spFontsizePlus").src = "/site-templates/detecon-dmr.21torr.com/img/btn_plus.gif";
          document.getElementById("spFontsizeMinus").src = "/site-templates/detecon-dmr.21torr.com/img/btn_minus.gif";
        }
        //alert(spEmBody.style.fontSize);
  }