function esIE30(){
    var browserType=navigator.userAgent;
    if (browserType.indexOf("MSIE")==-1)
        return false;
    else
        return true;
}


 ns4 = (document.layers)? true:false
 ie4 = esIE30();

	function Imprimir()
	  {
	    AntesImprimir();
		window.print();
		DespuesImprimir();
	  }

	
	function AntesImprimir()

          { 
	    if (ie4) 
		{document.all.TablaBase.width = "100%";
		    document.all.ImagenCentral.width = "650";
		}
	    else
                if (!ns4)
		{  document.getElementById("TablaBase").width = "100%";
		    document.getElementById("ImagenCentral").width = "650";
		}
		

           }
	function DespuesImprimir()
          { if (ie4) 
		{document.all.TablaBase.width = "760";
		    document.all.ImagenCentral.width = "800";
		}
	    else
		if (!ns4)
		{document.getElementById("TablaBase").width = "760";
		    document.getElementById("ImagenCentral").width = "800";
		}
		
	}