Thanks Pietro, i cant see how mine is much different...

var hideLayersVar = '"'+eventArgs[0]["Id"]+'"';
        var url = "http://10.1.1.22/mapguide/mapagent/mapagent.fcgi";;           
                          
        
        var params = {
              mapdefinition: 'Library://Map/View/TestMap.MapDefinition',
              //mapname: 'TestMap',
              format: "PNG",
              behavior: 2,
              groupName: "Test layer",
              hideLayers: hideLayersVar,
              //showLayers: null,
              hideGroups: null,
              showGroups: null,
              }
        
         alert(hideLayersVar);
        //alert('"'+eventArgs[0]["Id"]+'"');                                    
                                              
        
        var options = {
              singleTile: true,
              isBaseLayer: false,
              visibility: true,
              maxExtent: this.maxExtent,
              maxScale: 1,
              minScale: 10000000,
              alpha: true,
              transitionEffect: "resize",
              units: "m",
              useAsyncOverlay: true,
              //useOverlay: true,
              ratio: 1,
              maxResolution: "auto",
        } 
        
        
        var layer = new OpenLayers.Layer.MapGuide("Test Layer", url, params,
options);



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