;
    tabLeft = document.getElementsByClassName('admin-tab-left')[0],
    tabRight = document.getElementsByClassName('admin-tab-right')[0];

for(i = 0; i < targetElementInner.length; i++ ) {
  if( !isNaN(targetElementInner[i].offsetWidth) ) {
    var tmpmargin = targetElementInner[i].currentStyle || window.getComputedStyle(targetElementInner[i]),
    regExp = /(\-|[0-9])+(.[0-9]+)?/g,
    targetMargin = Number(regExp.exec(tmpmargin.marginLeft)[0]);
    tmpwidth += targetElementInner[i].offsetWidth;
    tmpw