function checkKey(key_event)
{
    var event = key_event || window.event;

    if(!event) return;
    var key = 0;
    
    if (event.keyCode) { 
      key = event.keyCode; // IE 
    } 
    else {
      if ( typeof(event.which)!= 'undefined') { 
        key = event.which; // ff
      }
    } 
    if( key == 13 ) {
      return true;
    }
    return false;
}

/* function for setting green background for every second box in the community sidebar */
function setSidebarBoxesBackground(sidebarID, boxCssClassName, boxNewCssClassName) {

  var sidebarElements = document.getElementById(sidebarID).getElementsByTagName('div');
  var count=0;

  for (i = 0; i < sidebarElements.length; i++) {

    var elem = sidebarElements[i];

    if (elem.className == boxCssClassName) {
        count = count + 1;
        if(count % 2 == 0) {
           elem.className = boxNewCssClassName;
        }
    }
  }

}