code: function(el) {
          var zoomIn = document.getElementById(this.zoomInId),
              zoomOut = document.getElementById(this.zoomOutId);
          if (!zoomIn) {
              zoomIn = document.createElement("a");
              zoomIn.href = "#zoomIn";
              zoomIn.appendChild(document.createTextNode(this.zoomInText));
              zoomIn.className = "olControlZoomIn";
              el.appendChild(zoomIn);
          }
          OpenLayers.Element.addClass(zoomIn, "olButton");
          if (!zoomOut) {
              zoomOut = document.createElement("a");
              zoomOut.href = "#zoomOut";
              zoomOut.appendChild(document.createTextNode(this.zoomOutText));
              zoomOut.className = "olControlZoomOut";
              el.appendChild(zoomOut);
          }
          OpenLayers.Element.addClass(zoomOut, "olButton");
          return {
              zoomIn: zoomIn, zoomOut: zoomOut
          };
      }
docs: Method: getOrCreateLinks
  
  Parameters:
  el - {DOMElement}
  
  Return:
  {Object} Object with zoomIn and zoomOut properties referencing links.