Dojo Check Box easy question.

function changeMap(layers) {
            var ShowLayerName, HideLayerName
            if(layers === 'streetMap'){
                //alert("Found streetMap - " + layers);
                HideLayer([imageryPrime])
                ShowLayer([streetMap])
            }    
            if(layers === 'imageryPrime'){
                //alert("Found imageryPrime - " + layers);
                HideLayer([streetMap])
                ShowLayer([imageryPrime])
            }         
 
 
 
            if(layers === 'streetMap2'){
                //alert("Found streetMap - " + layers);
                
                 var layer3 = "streetMap"   
                 var tmpTA = dojo.byId("chkTA");
  				    if (layer3.visible){
  				        alert("layer3.visible = true")
  				        tmpTA.Checked = false;
                        HideLayer([streetMap])
                    }
                    else{
   				    alert("layer3.visible = false")
                       tmpTA.Checked = true;
                        HideLayer([imageryPrime])
                        ShowLayer([streetMap])
                    }
                    
                
                
                
                      if(dijit.byId('chkTA').Checked){
                        //ShowLayer([TradeAreaTracts]);
                        alert("Found chkTA True - " + layers);
                     }
                     else
                     {   
                         alert("Found chkTA False- " + layers);
                       //HideLayer([TradeAreaTracts]);
                    }  
                //HideLayer([imageryPrime])
                //ShowLayer([streetMap])
            }  
      }
 
 
 
 
      function ShowLayer(layers) {
      alert("ShowLayer")
        //hideImageTiledLayers(layers);
        for (var i=0; i<layers.length; i++) {
          layers[i].show();
        }
      }
 
 
      function HideLayer(layers) {
        //hideImageTiledLayers(layers);
        for (var i=0; i<layers.length; i++) {
          layers[i].hide();
        }
      }
 
 
 
 
    <input id="chkTA" dojotype="dijit.form.CheckBox" name="chkTA" value="streetMap2" type="checkbox" onclick="changeMap(this.value);"/>
    <label for="chkTA"> Street Layer </label>

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