function viewPdf(pdfFileName)
{var win;
 if(win){
                    Ext.destroy(win);
                    win=null;
                }
  if(!win){
            win = new Ext.ux.MediaWindow({
        id:'PDFViewerWin',
        renderTo: document.body,
        height: 500,
        width : 600,
		title:"Pdf Viewer",
		maximizable : true,

        mediaCfg:{
            mediaType   :'PDF'  //underscore not required in definition
           ,url         :pdfFileName
           ,unsupportedText : 'Acrobat Viewer is not Installed'
           ,params      :{page:1}
           }
		   			/*  ,tbar:[{
 text:'Reload'
 ,handler:function() {
	 win.destroy(); win = null; }
}]*/
      });

        win.show(this);
    
}
}